In my experience, non-primary residential SFH requires 20% & multi-units require 25%.

Consider factors such as desired return on investment, risk tolerance, and investment timeline.

My fervor and desire to jump into the game and become financially free was quickly deterred by people telling me I needed to get through school and start making money before I should get into REI.

Second, pretty much every hard money lender has this same requirement.

It's easy to obtain, costs very little, and doesn't require extra, on-going effort to maintain. 

We have a tenant in process- my property manager is telling me that he uses Turbo Tax and the lease he generates only requires his signature and the tenants.

They have different payment methods, payment plans, payment requirements, charges, marketing needs, reports, etc.

The more familiar they are with the area and the laws/requirements for working in that area, the better.

Or call your preferred settlement agent and ask them to provide their seller settlement costs, then add in any commissions, HOA, termite/moisture inspection if required, etc.

I'd find a lender that can do deals with brand new companies and do not require seasoning, if you choose to go that route.