There are loan programs that would allow you to potentially use that income toward the loan but it's not possible to determine your ability to purchase without the detail that an official loan application brings.Also, don't worry about your credit until you meet with a banker and find out if your current credit will not work. 

However, when finding rentals it all about the cap rate and your end strategy to determine if a property makes since to purchase.

I'm determined to buy a property in the next few months, but I will need enough time to analyze them with the BP calculators to ensure I get the right deal.

I would look at the rental market and determine market rent.

But regardless, you should always start by educating yourself, which it looks like you are doing already.Next step would be to determine what vehicle or strategy within multifamily is going to take you to where you want to go.

There's enough resources on this website and the rest of the internet to answer almost all of the other questions you're going to come up with as you dive in.

You might talk to the tenant to determine terms they're seeking.

Determine if property is still occupied, research if tenant or owner7Estimate RehabEstimate approximate rehabilitation costs based on drive-by (and can view inside windows)8Research TitleSearch title making sure that the deed being bid on is for a first mortgage, not 2nd or HOA or Tax Lien.

If you spent as much of your time on the Internet as I did you would realize that people today are taking advantage of doing things on-line is the typical way people do things without having to leave work or home. 

Analyze your rental history and determine what months you will make the most through short-term rentals.