Blank screen on Wp/admin page. How Can I fix it?

My site seems to work fine when I look at it, but I get a blank screen when I try to log into my wp/admin dashboard. I don’t know code, so the fixes I’ve looked up seem to complicated for me to try, but when I put in the debugging code, this is what comes up on the admin page, is there an easy fix for all these?:

Notice: Use of undefined constant headerfixedsocial - assumed 'headerfixedsocial' in /home/bizmom/public_html/wp-content/plugins/easy-buttons/easy-buttons.php on line 726

Notice: Use of undefined constant fixed_icons - assumed 'fixed_icons' in /home/bizmom/public_html/wp-content/plugins/easy-buttons/easy-buttons.php on line 727

Notice: add_option was called with an argument that is deprecated since version 2.3 with no alternative available. in /home/bizmom/public_html/wp-includes/functions.php on line 3008

Notice: wp_localize_script was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts, admin_enqueue_scripts, or login_enqueue_scripts hooks. Please see Debugging in WordPress for more information. (This message was added in version 3.3.) in /home/bizmom/public_html/wp-includes/functions.php on line 3049

Notice: register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information. (This message was added in version 3.1.) in /home/bizmom/public_html/wp-includes/functions.php on line 3049

Notice: add_option was called with an argument that is deprecated since version 2.3 with no alternative available. in /home/bizmom/public_html/wp-includes/functions.php on line 3008

Notice: add_option was called with an argument that is deprecated since version 2.3 with no alternative available. in /home/bizmom/public_html/wp-includes/functions.php on line 3008

Notice: add_option was called with an argument that is deprecated since version 2.3 with no alternative available. in /home/bizmom/public_html/wp-includes/functions.php on line 3008

Notice: Undefined index: mobile in /home/bizmom/public_html/wp-content/plugins/post-layout/plugin.php on line 313

Notice: Undefined index: optin in /home/bizmom/public_html/wp-content/plugins/premise/premise.php on line 2222

Notice: Undefined index: api-key in /home/bizmom/public_html/wp-content/plugins/premise/premise.php on line 183

Notice: Use of undefined constant rm_startsWith - assumed 'rm_startsWith' in /home/bizmom/public_html/wp-content/plugins/rebelmouse-widget/rebelmouse-utils.php on line 5

Notice: Use of undefined constant rm_endsWith - assumed 'rm_endsWith' in /home/bizmom/public_html/wp-content/plugins/rebelmouse-widget/rebelmouse-utils.php on line 15

Notice: Use of undefined constant rebelmouse_request - assumed 'rebelmouse_request' in /home/bizmom/public_html/wp-content/plugins/rebelmouse-widget/rebelmouse-utils.php on line 27

Deprecated: Call-time pass-by-reference has been deprecated in /home/bizmom/public_html/wp-content/plugins/seo-content-control/seo_content_control.php on line 1087

Deprecated: Call-time pass-by-reference has been deprecated in /home/bizmom/public_html/wp-content/plugins/seo-content-control/seo_content_control.php on line 2172

Notice: add_option was called with an argument that is deprecated since version 2.3 with no alternative available. in /home/bizmom/public_html/wp-includes/functions.php on line 3008

Notice: Undefined index: action in /home/bizmom/public_html/wp-content/plugins/wp-genericfooter/WP-GenericFooter.php on line 83

Notice: Uninitialized string offset: 0 in /home/bizmom/public_html/wp-content/plugins/wp-leads-mailchimp-constant-contact-and-salesforcecom-integration/constantcontact/constantcontact.controller.class.php on line 168

Notice: Uninitialized string offset: 0 in /home/bizmom/public_html/wp-content/plugins/wp-leads-mailchimp-constant-contact-and-salesforcecom-integration/constantcontact/constantcontact.controller.class.php on line 169

Notice: Uninitialized string offset: 0 in /home/bizmom/public_html/wp-content/plugins/wp-leads-mailchimp-constant-contact-and-salesforcecom-integration/constantcontact/constantcontact.controller.class.php on line 170

Notice: Uninitialized string offset: 0 in /home/bizmom/public_html/wp-content/plugins/wp-leads-mailchimp-constant-contact-and-salesforcecom-integration/constantcontact/constantcontact.controller.class.php on line 171

Notice: Uninitialized string offset: 0 in /home/bizmom/public_html/wp-content/plugins/wp-leads-mailchimp-constant-contact-and-salesforcecom-integration/salesforce/salesforce.controller.class.php on line 191

Notice: Uninitialized string offset: 0 in /home/bizmom/public_html/wp-content/plugins/wp-leads-mailchimp-constant-contact-and-salesforcecom-integration/salesforce/salesforce.controller.class.php on line 192

Notice: Uninitialized string offset: 0 in /home/bizmom/public_html/wp-content/plugins/wp-leads-mailchimp-constant-contact-and-salesforcecom-integration/salesforce/salesforce.controller.class.php on line 193

Notice: Uninitialized string offset: 0 in /home/bizmom/public_html/wp-content/plugins/wp-leads-mailchimp-constant-contact-and-salesforcecom-integration/salesforce/salesforce.controller.class.php on line 194

Notice: Use of undefined constant __FILENAME__ - assumed '__FILENAME__' in /home/bizmom/public_html/wp-content/plugins/wp-leads-mailchimp-constant-contact-and-salesforcecom-integration/wpleads.php on line 169

Notice: wp_enqueue_script was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts, admin_enqueue_scripts, or login_enqueue_scripts hooks. Please see Debugging in WordPress for more information. (This message was added in version 3.3.) in /home/bizmom/public_html/wp-includes/functions.php on line 3049

Notice: register_sidebar_widget is deprecated since version 2.8! Use wp_register_sidebar_widget() instead. in /home/bizmom/public_html/wp-includes/functions.php on line 2908

Notice: register_widget_control is deprecated since version 2.8! Use wp_register_widget_control() instead. in /home/bizmom/public_html/wp-includes/functions.php on line 2908