Fees should be clearly stated in writing, easy to understand, and justifiable.

Look for your states offer to purchase contract online or contact a realtor to get a blank copy. review the agreement to be sure assignment is not expressly excluded. if there is nothing excluding assignment from the contract then writing the words "/And or Assigns" after the name or company's name on the buyer's line should be sufficient.Good luck!

Fees should be clearly stated in writing, easy to understand, and justifiable.

I use credit cards, write checks, and pay in cash.Each situation can dictate the payment type. 

I obviously want to get the best tax benefits and write off the expenses for the house and repairs I have done.

Implement documented repeatable processes to reduce errors and improve service levels.By being efficient, and cutting some of your costs you can hire better talent with the leftover cash. 

If you have anything in writing(texts, emails, contracts, etc) gather those.

That someone will write a long answer that will tell you how to do it? 

You could get everything in writing but you'd have to evict if purchase didn't go through.

Anything and everything that you can do to show others (and prove to them) that you have a talent for selecting properties and producing actual results.If you do that, people will take notice.