migration issues

I’m trying to copy my site from my hard drive to my hosting account.

So my host provides install through their control panel but when I do that its an older version and for some reason it won’t let me update it automatically. So I updated it manually. Then I installed my theme that I have designed on my local drive. It loads up fine. The theme works for the homepage but when click the default ABOUT page that comes with WP it gives me a 404. That goes for everything, the default blog post and new pages I create and try and view… What is going on? Anyone deal with this before? I Wish I was better with server stuff but I’m not. HELP!