You may want to read the <a href="http://www.wdwinfo.com/disney-vacation-club/RentTrade-FAQ.htm">Rent/Trade FAQ.</a> It will get you started with the general process. You can also learn a lot just by reading the listings already made on this board. You should also review the posts at the top of the page marked "Important". They will also offer some advice.
Everything is to be agreed upon between the involved parties and the member will always have control over the reservation. Just try to establish policies you would be happy with as the member and as the renter and you should be fine.