However, you could buy a property with seller financing.

I agree with @Aaron Zimmerman—setting up your chart of accounts to align with Schedule E/1040 or 1065, depending on your type of entity, will again take some of the heavy lifting come tax time.

As Andrew said, starting with a house-hack is a great way to get started.

First I would make sure where you are building allows STRs with no or few restrictions.

And yes, you could engage with a Turnkey company as well. 

Find a good lending partner that is comfortable with lower property values both on the purchase, as well as knowing a group or two that can financing projects under 100k on a 30 year fixed.

The property is worth exactly what it is with zero STR rental income.

Is there anyone out there with any advice?

Certain lenders can accept higher than 50%, and may be able to execute even with an exception. 

Anyone have experience with this course?