These are two good places to start your research. Another good place is a recent post that asked if DVC was right for them. Once you've looked over these sites, you are welcome to ask more specific questions here. Best wishes.
The answer to your question would fill a book. Disney will send you that book, for free. Just go to www.disneyvacationclub.com and request the information package; they're real low-pressure and won't pester you.
Note: The info that Disney sends won't discuss renting your points, or renting points from a member, since they don't get involved in private transactions between individuals. But, you can find all the info on renting that you need in the FAQs/stickies on the Rent/Trade board.