A one sheet could outline the deal, and from that your experience should tell you if the deal is worth looking at further?  

At the very least write a letter to the seller outlining your offer and justification.And as mentioned in a different post by @Jay Hinrichs have a photocopy of a cashiers check for the offer amount.Keep in mind that when submitting an offer on a listed property that using the Listing Agent is always your best option.

This should be outlined in the lease, with an agreed amount of $75 or more each time.

There are cases where the City's planning department will allow you to do something that's questionable if you agree to sign a recorded agreement that outlines what you will and won't do with the room/building.  

The seller is still liable for those mortgage payments, plus any late fees or other penalties if something happens to the buyer and they can't make the payments (or they are dishonest or inept to begin with, like in this case outlined right here: https://www.subto.com/post/what-are-the-risks-of-buying-a-pr...).

@Daniel T StockmanFor my rental properties I have been trying to follow the bank account method outlined in the book Profit First.

This markup is outlined in our Property Management Agreement, and covers the cost of our time.Poor service quality. - We only do property management.

I dont know your qualifications, history or anything and some may think it is improper to advise such things not knowing the entire situation, BUT, experience is the best teacher and with mine working with clients as a real estate investment broker, I have yet to work with a client that could create the product that was asked of them, within the time that was outlined for them, within the budget that was set for them - all in all costing them big bucks in mortgage payments (not really that huge, but when its their only deal and they work a 9-5, it is kind of a big deal - get it?).

Outlining our dreams can be fun and motivational st the same time !

We do believe that your primary home is a LIABILITY not an ASSET as outlined in Cash Flow Quadrant, so we are going to rent and invest our money in Buy/Hold Assets.