Never use the word "simple" in a commercial inquiry.
There’s almost always more to it than you think of at first.
Creating a web page in code is simple, but I’m guessing that you want something ON that web page and getting the code to produce exactly what you want can be time consuming.
There are also quite a number of ways to implement the security aspects of this (snippet, plugin, ACLs, etc.) and it will take a while to decide on which you want and another while to implement them.
Some other questions come to mind too:
Do you want the user re-directed to their own page on login?
What should happen when users try to access someone else’s page?
Will there be a page listing all users?
Will you be doing all the CSS and HTML of the member pages?
Will you need any modifications to the Create/Edit User form in the Manager (i.e., extra fields).
Will there be content on the member page that is unique to the member but that is not in the user or user profile tables in the DB?
Do you expect to let the user modify his or her page?
Will the member’s personal page ever have any children or siblings that the member can see?
You’re more likely to get a response once people know a little more about exactly what you want.