The Sites I Uses and Recommend.

***Disclaimer: Some of these are affiliate links***

Domain Name:

I currently use Dotster for only my domain name.

Host:

Personally I use Siteground.com

Other options that other people I know are happily using  are but not limited to:

Dream Host

WP Engine
They will host and manage your WordPress site for you

  On Line Learning:

I tried a few on line classes.  For me personally, I discovered that Treehouse worked best for my learning style.

Other options that other online school I have tried that are good are:

Lynda.com

Code Academy

  Maintaing your site:

I maintain my own sites but I heard great things about the following companies.

Maintainn.com

WP Engine
They will host and manage your WordPress site for you