Well...here are a few questions and it'll be easier for myself and others to help you out.
What is it you are interested in doing?
I run 3 NOT 1 but 3, membership sites, each run completely from wordpress, (2 are complete and fully running, another I'm creating as I am writing this).
Memberships sites with wordpress are as easy as....install...write "stuff"....watch your paypal account.
The write "stuff" is the hardest part of all, of course.
Tell me what you're interests are? Would you be interested in running a membership site?
What if I said I'll run it right by your side?
Tell us more about your ideas, and I'm sure we'll be able to help.