Unless you've got the inside track for the market turning around.Why do you think you could get $2200 in rents?

So I am closing on my first 100% seller financed deal tomorrow and would like to understand how to handle the payments, especially for tracking purposes come tax time.

As far as I can see you are on the right track.  

They're incredibly advanced because Facebook keeps track of everything we all do while logged in on Facebook.Facebook is also partnering with other companies and credit card companies that track our behaviors and what we spend our money on!

I even have some random facebook friends I've never met giving me money because they read my posts and see my track record.

Plenty of people have marginal credit because of some life circumstances and got off track for some reason.

This is for two reasons: 1) I'd like to get a sense of what it is like to be a landlord without going "all in", and 2) Being a younger investor I am thinking a bank would be less apt to lend to me for commercial until I have a proven track record of success.

If another tenant months or years from now was ticked at me and decided to file a lawsuit and some lawyer was able to track my records to determine that I made an exception for another tenant and didn't offer them the same courtesy, I could get into a lot of hot water.What do you think? 

Then if something has to be re-filed, a person has to be tracked down, a quiet title action has to be completed, etc. it is on them to use their resources to fix it. 

you are in the right track to start your real estate career you can learn more here and free to ask question with friendly members in Biggerpockets.Hope for your successful career.