Not an app just data, but this is a great website to know what the bottom for rent is for section 8 often times, this isn't true all the time so you have to be aware (it is more true in more populated cities).

One option is to pay down any existing debts (credit cards, car loans, etc.) to free up income capacity.

Makes it easy to keep the cash organized as well as bills.You don't need a credit card but debit cards for each place makes it easy.

Some comments on this are harsh, but frankly they are very true.

Building will not be in the cards for those prices and land opportunities right now.

If you don't have the downpayment, go make some cash so that you do, either through saving from your normal income or some real estate investing efforts.Your point on debt paydown, although true, is not relevant to the argument of BRRR vs. traditional rental.

For guests, if it checks the "W/D" box then whatever fits will be fine, I don't think there is a true minimum.

Many investors choose a profit-sharing model for true equity partners, often splitting profits 50/50 or based on the level of their contribution to the deal, but ensure everything is clearly defined in writing to avoid misunderstanding/miscommunication. 

Maybe paying off credit card debt or other debt on your report to reduce the minimum payments, increasing the downpayment, finding a house that doesnt require HOA or flood insurance (if applicable), etc.

Sign up for their card and save another 10% or something.