I think @Aaron Impens will be able to help more than I can but I would say, in the beginning or maybe always, make sure your mistakes are small ones. 

Mistake noted, understood and will be remedied on the next acquisitions.

It seems I may have made a mistake in my calculation@Zack Karp See my input above on my DTI.

P.S: I apologize if I have any English mistakes, please excuse me.

I am learning and reading books currently so before I take my first crack at it, I have those systems in place and can minimize my mistakes for my businesses success.

In other words, you can see the slow down in growth before real estate prices flatten or drop.Coming out of a recession, look how job growth goes from it's worst (about 5% job loss in worst year) to 2% job loss the next year, 0% the following year, then 2% gains, then 4-5% gains, then starts lessening again to 3%, 2.5%, and tends to drift back down towards 0% again, before going negative..

You will gain a wealth of knowledge on BP, but getting out there and actually doing it without getting discouraged when you make mistakes will be the real knowledge.

Cars are the worst investment ever!

A good starting point would be a 50k house and make your mistakes.

-Sidewalk visual inspection - No apparent major issues/looks well kept-No rent controlBesides inspection/title search and other basics, are there any other formulas, things you like to ask for, things you've learned from mistakes with multi-units, etc?