Subscription to my WP site for access to more info?

I want to be able to only allow users to subscribe to my WP to be able to access more information and or if they can be auto put on a subscription list when they post. The site will have mainly all YouTubes so they will often watch and not post or subscribe so i want to make them subscribe to get in.

Then be able to being able to email all my subscribers a Newsletter from an easy interface and store the emails listed in a standard blog pages in a side bar list.

Allowing to read some stuff to lure people in. Will this be difficult to set up? Where should i start.