Hello forum I am a super noob

regarding how the lending work for lender/borrowers if someone would help me a out with some question it would help me a lot.
1. let say that i want to request a loan for ex 1 btc and i can offer a collateral, how do i sign the message that everyone use?
2. how do i find a escrow and is it use?
3. how do i move to ranking and gain merit ?
thanks a lot