House for sale by Owners - Questions

[Kevin LIVINGSTON]

We have a deal in front of us and we need a little advise. Some friends put us in touch with this deal and we want to help them and ourselves to a win / win

1100 s.f. house 3/1.5 in an ok neighborhood. Clean the carpets and its ready to rent. Very well keep little house. Newer Heat and air. New windows. Roof 10 years old. 

The owners are wanting to sell fast(leaving town) and do not have a Realtor yet. They have looked on Zillow and said it is worth 80,000. I show this house should sell per the comps in the area for about 73.000  and I am sure we can rent it for 850.00 a month. We want to buy and hold. it is only 4 blocks from our home. 

Offer is not been presented yet. Any advise? 

 Where to go next? We have bought at Auctions and with Real estate Agents but never from the owners. Do we need to get a lawyer to make a contract and them find a closing company? Should I get my agent in on this? Any advise will help.