How to get a property under contract

[Dakoda Spencer]

Could someone please lay out to me in very easy English how to get a property under contract? 

Here's my situation: I am talking to a homeowner that is interested in a cash offer of 70%. I have other forums posts searching for WV agents willing to assist me in pulling comps and also searching for a contractor to walk properties with me. After I come up with what my maximum allowable offer, how do I give that to the seller? Do I simply email the contract to the seller, have them sign it and mail/email it back to me? How do I come up with the contract that I send the seller? 

If you could, please explain it as if it was a flow chart. That's just how I understand things. 

Thanks, Dakoda