today my problem is resolved
thanks god and get a loan from my bank
i will buy 5 btc
i want to invest it in lending here
i want to lend any one but what is the valid collateral i ask from any one here?
when i can start?
You can start any time you want. Start by reading the stickies in this section. You can start with this
https://bitcointalk.org/index.php?topic=577765.0 to see how collaterals works. It also has a list of valid collateral.