first wholesale deal in the works

[Marquest Page]

Hey guys. I have a property under contract that I'm trying to wholesale as rental investment home. I placed an ad on Craigslist and I've been getting some interested buyers. This is my FIRST DEAL EVER. I'm not sure if I should ask for a non refundable deposit or just wait until I assign the contract to them. I don't even know how to go about assigning the contract, well I do in theory but never done it so I don't know what to expect. Also I'm not sure when I should start looking for a title company and when I should get them involved in this process. Any feed back would be awesome.