You forgot to say what kind of lender and collateral OP should accept. Note not all lender/user here can be trusted even just $20 lending amount is possible to lost the same to collaterals. I suggest you (OP) to check and read the
lenders threads to for reference if you're going to have a lending business.
Borrower requests loan from lender. Lender specify the interest rates and terms, with collateral requirement upfront. Borrower agrees, and sends over the collateral (default between 110 - 120% loan value). Lender receives collateral, sends over loan to borrower.
Everything goes smoothly, borrower returns funds borrowed. Lender then returns the collateral.
I have read that lending threads they are mostly not active as gambling threads are active. Secondly there are more borrowers then lenders and one need to be very careful with collateral.
What type of collateral one should accept if you are starting lending on bitcointalk.org?