Anthony and Greg gave good info.Freddie Mac or Fannie Mae agency loan options depend on the property's economic vacancy at the time of loan application submission, physical occupancy for last 90 days, submarket, and your net worth and liquidity cash position. 

That is when those who aren't liquid, or are over leveraged, could be in trouble

I am just wondering if someone can help me navigate some of these finer details... ultimately my goal is to buy the property using less of my money that I have liquid now, and use the money that I’ll be making by buying the property with equity already in it

You might be able to use Schedule E/C from a previous owner who was renting the property.

It's been reported on your schedule E as investment and depreciated as investment. 

@Stacy Manson An individual 401(k) (also called Solo 401(k)) is my favorite retirement account for self-employed individuals that do not have employees.

Landlords can deduct the interest they pay on the mortgage for a rental property, however, this must be claimed as part of the property's expenses on Schedule E."

If you buy a 3 or 4 unit you will need to have a post closing liquidity of 3-6 months of mortgage payments, you will just need a little more in the bank as opposed to just buying a duplex.You can also use the 203k Loan, same 3.5% down, but you will purchase a property that needs a rehab, use a general contractor, close the loan, rehab the property, and move in once finished.

Investment Info:
Single-family residence wholesale investment.

Purchase price: $100,000

Cash invested: $1,000

Sale price: $108,000

Another fast wholesale deal. End buyer wanted it but couldn't...

@Lynnette E.