So it won't be a "monthly" fixed rate, or even a daily fixed rate, it will be different every month.

I plan to build up some capital mostly through fix and flips to the point where I can put 20% down on rental properties and even BRRRR some small multi-family properties down the road. 

I'm in Philly and on a duplex/triplex and owner occupied building.. you can put down 5%, conventional mortgage, 30 year term, as long as the rentals pay a good amount of your PITI, you're fine(4) YES.. usually (but not always) buying a property that needs some rehab work will net you more money in the long run because of your forced appreciation in fixing the place up (read: sweat equity). 

So you'll need to know the market well, what fixed up homes sell for, and how to generally estimate repair costs to know if you can make a deal or not. 

One house as a fix and hold.

What BP calculator should i be using for the fix and flip mobile home as well as what calculator should i be using for the purchase and resell mobile home on payments owner finance?

My girlfriend's parents have been doing live-in flips for the past 10 years, and that exposed me to how profitable a little extra work can be.After another year or so of saving up money for a down payment, I plan on buying a house to fix and flip over the course of a couple years.

My questions are, should he sell me the house first then use my money to fix it up?

To anyone who fix and flips/ buy and holds in Atlanta, tell me the best ways that you find deals and what area do you really want to be in?? 

She writes 30 years fixed in nearly every state for properties past 10.