Mortgages are the last thing to default for a homeowner and appreciation has been so high in Canada that every homeowner who has purchased before 2022 has gained equity and could just refinance their loan over a longer amortization before defaulting.

What paperwork should I keep a paper trail of to make things like taxes and other situations better/easier for myself?

(Again, ask the bank.)These days I lean toward flips (which is unusual for me) but if the numbers show it cash flows all in with a 7% loan, then sure.

I can help run their existing numbers to get more of an idea of the Business's Financials and work with you on how a loan payment would affect cash flows. 

In reality, it’s pretty rare to find a DSCR loan going up to 95% LTV.

And you'll have a solid W-2 income to help you qualify for loans. 

It's possible but going to be expensive and I would think they would want some collateral on the loan as well.

Cash flow is definitely the biggest challenge; both in terms of finding properties to buy that cash flow with a loan on them and just company wide given interest rates and labor/material is up and, at least where I'm at in Jackson County, MO, taxes are way up too. 

How can I build my credit and financial profile to qualify for loans?

If you are getting a loan no there is no way to protect yourself from crushing your credit or having a foreclosure against you if you are the borrower.