If you have no money or credit, you can still invest your time and effort in finding the right deals and then selling your right to buy them to another investor (this is called wholesaling) in exchange for a wholesale fee which could be in the range of $5,000 to $20,000 (depending on the deal).

If you really want to rent properties out, you can also buy the property "subject to" - that is you can get the deed. I have acquired my first 4 rental properties in this way - I did not put any money down nor did I qualify for a bank loan. For more information, check my blog -