@Edward Payne, Wow! I am amazed at some advice that other investors give on this forum. I firmly disagree with @Chris Grenier on his advice to you. Here is what I actually do in two states:
First, find out what buyers are paying for rehabs. In utah and Idaho I find that rehabbers will pay about 80% of ARV minus repairs. The formula of ARV x .70 minus repairs = MAO (Maximum allowable offer) still applies but needs to be tweaked depending on the market. Most markets are hot right now and rehabbers will pay more. You also will be able to offer more to the sellers so you will have a better chance of getting more offers accepted.
Now that offer does not include your fee. So you should be offering less than the MAO. The minimum fee I try to get on every deal is $10K.
I am not a fan of writing your name or entity as the buyer and adding "and or assigns" to it. I use a REPC that makes it clear that the contract is assignable. I also create an addendum which includes again that the contract is assignable. I have a few disclosures that I include in every agreement stating I am a "for profit" company and I will either buy and fix this property, buy and hold it or sell it quickly for a profit. Not once have I ever been told "no" because I had an assignment of contract clause in my REPC.
As far as earnest money goes, it is up to you and the seller to agree what that should be. If you don't have the money for a significant earnest money deposit just put in the agreement that the deposit will be made with the Title Company within 7 business days. If you find a buyer by then have them deposit the earnest money with the Title Company. Always make sure to collect significantly more from your buyer than what you have agreed to give to the seller.
Once I have a purchase agreement on the property I go and order a title check. You can wait on this step until you find a buyer but I get it done right away. That way I know if there are any issues on title I need to deal with.
Once I find a buyer I send them an Assignment of Contract document. It states what I am charging for this Assignment (if it is a fairly significant fee you may want to consider doing a double close). They sign the Assignment and deposit a non-refundable earnest money deposit with the Title Company. I send the buyer the original contract and set them up to work with the Title Company. I send the Assignment and the original Purchase Agreement to Title with the names and phone numbers of both my Buyer and Seller.
I let the Title Company know I want the closings to be separate and that I do not want the seller to see the Buyer's side of the HUD1. I don't want the seller to know what I made on this deal. Send your wiring instructions or set up a time to pick up your check after the deal has funded and recorded. I suggest you don't even go to closing!
Don't get me wrong, you have to manage this whole process. You need to know the Title Company knows what they are doing. You need to instruct the buyer and seller to do what they need to do or else nothing ever gets done.
Hope that helps!