Protected Content Plugin - Cannot get how to set it up

I have uploaded the protected content plugin and read all the instructions you gave.
However, I cannot understand how to actually operate it - after setting up membership and restricted content.

My use case is simple.
I do not want to charge for membership.
I want to have different type of content to different type of membership.
I want the user to sign up as a member (is there are way for me to approve him before he is actually permitted to see the content? )
Thank I want him to go to a page where he can see all the link to the content that he is allowed to see .
I do not need to account page.

I do not understand how to structure that.
Please help / send me to the right tutorial - as your current ones are only for setting up the actual membership