Setting up an account page for members to manage subscriptions

I have a Welcome page set up with instructions to different levels of visitors about what to do next to access level-specific downloads, etc. I'd like to include a link fot them to Manage their Account (accounts page). I have set up an account page but there is nothing on it - how do I set up an accounts page like it appears in the manual, and also how do I offer members a menu item for their account that is blocked to visitors and allowed to members?

I essentially want to enable members to manage their account/subscription easily by clicking on the link to their accounts page. But what do I need to include on that page or is content automated?

Many thanks for your help.
Kind regards
Cheryl