Other finance options typically have worse terms. 

It's a made up term for BP that people use first as a bragging point and second as some sort of proof of experience and quality.

I have been mainly a buy and hold investor till now.

Keep in mind that I primarily flip and hold rentals.

I’ve already made some calculated evaluations in terms of the expected operating expenses, the mortgage, closing costs, and a 20% down payment. 

Welcome @Sartaj Ghai,Sounds like you are off to a good start and have the right long term mentality to go far with this!

Having a separate account to hold security deposits is a good idea.Having another account for business operations is also a good idea.There is zero risk in opening a bank account and it doesn't take that long so you can do it now or do it later.Good luck

Life is too short to worry about things like this.

There's no set point to stop; it depends on your investment goals and tax strategy.Considerations: Consult with a tax professional to tailor this strategy to your specific financial situation, investment goals, and long-term plans.

The tenant's are moving out this summer and I'll be looking for new tenants, however, I'd like to rent out my unit to mid-term tenants while I'm away traveling for months at a time.