My loan processor sent 1098s to the landowners on my behalf, but I did not receive any tax forms. 

That’s typically way ahead of the curve. 

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+, zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680, some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

typically a BRRRR property is so distressed that it's not possible to purchase with conventional financing - so the usual options are actual cash from your own checking account (if you have it), or private money or hard money. 

If you're buying as an owner occupant, your interest rate will be about 1% lower, so you'd be closer to 35% down.But with low risk real estate investments you typically have an appreciating asset, and high rent growth.But if you are buying with a VA loan with 0% down the reality is 100% leverage, it will take many years and interest rate drops to get to break even.

This typically requires 125% of the mortgage debts in available assets. 

Any questions you have along the way, post them up and you may be surprised how many thoughtful responses you'll receive.   

Typical requirements for a HML: recent bank statements, credit report, appraisal/BPO with as-is and ARV, sales contract, scope of work/budget-draw schedule, track record/previous purchase and sales HUDs/ALTAs showing the construction holdback amount, etc.

A lender is not going to lose money on a deal for you to gain experienceYou will need to partner with someone to get experience and at the same time start savingTo answer the other question you typically will need 20-30% down to get hard money

Another thing you can do when you receive one of these texts is immediately report them as spam to your cellular carrier.