First potential wholesale deal: Help!

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I found a small 3 bed 1.5 bath country home in good condition [from what I can see]. The home is in a desirable area for a single family to buy or possibly to rent. It is out in the country but there are some businesses and not many other rentals available for those working in the area. Also, between the storm door and front door is a hand written message stating "would you like to rent to us? You wont regret it." Attached is a phone number, which I am tempted to call to see if these potential renters are still interested. The home is clearly vacant as grass is overgrown but from peeking in the windows I can see that the finishings in the kitchen are nice/updated and the home could, for the right price, make an excellent rental. I did some research and have had to call some extended family of the owner but I am expecting a call back later on today from the potential seller. The relative that I spoke with sounded very eager to pass on my name and information to her [uncle maybe?] The home seems to have been passed down from an aunt who passed in 2012 and the owner has another address listed in another state. For that reason, I assume that the seller may be motivated to get rid of the property. He and his wife are in their late 60's. I would love to make this my first wholesale deal but I don't know where to start. First, I'm looking for potential buyers so that I can get their criteria and use that as a base for making an offer when negotiating with the seller. Second, I need to know what is required of me as far as putting the deal together. Should I have the home inspected for example, and contact an attorney to help me put together the contracts? I'm also working on what to tell the seller when he calls me back. I'm planning to go with something like "I'm an investor looking for homes in the area that have not yet been listed for sale. I would like to analyze the property and see if I can use it as a rental unit, and if not, I would like to pass the property on to another investor who can use it. If you are interested in selling for the right price, I would ask you if I could go in and have a look around with an inspector [or contractor?]. My goal is to find a price that you are happy with and also be able to make use of the property myself. I'm not a realtor, and there won't be any realtor related fees. Can I ask you if you had any plans for the property?" I will then try to determine their specific motivation for selling. Lastly, before I begin negotiating with the buyer, how do I determine how much profit to take for myself?