What to do for more fun than business and improve technical DIY skills.

Guys,
Main purpose: Improve DIY skills and fun

I would like to have some input from you guys as you are very kind and helpful.

I am new to BimmerWorld, in search of some nice E36 and getting much help and knowledge from here.
I have not much experience with cars but enjoy to do work myself. So I am searching my first Bimmer keeping this in my mind
that I will do most possible work myself.

Beside this to create more interest, get more experience and enjoyment, is it possible that I can do something more which will
not only for fun but will generate some income. Purpose of this is not do some business, but I want to do like for fun.
For example if there is demand of a used part - named 'A' for example, now i keep searching in parts on craigslist, my neighbour or junk yards and find that part.

I only want to work on E36 because that would be my first Bimmer, don't want to do that thing which requires lot of time or money because that is for fun purpose and learning
purpose not for business or full time.

Thanks

Edit: I would like such an option where I can use my tools; DIY kind of project .. .