MAMP and WordPress

Hi,

1- How to create a new Website from scratch

After installing WordPress, you can go to Appearance -> Themes and try out themes available in WordPress.org repository.

If you want to build your own theme, you can use the following as a starter theme and work from it. http://underscores.me/

2- How to move that website from my localhost to my public domain host Company

You can use a plugin such as the following
https://wordpress.org/plugins/duplicator/

If you require professional help, you can look for it at the following website.
http://jobs.wordpress.net
https://jetpack.pro

Thank you