Additionally, the estimate for my tax preparation for this year was approximately $1,000 over the cost I paid last year (including the time I paid for them to correct their errors).

If the LLC is the maker on the note, there's a good chance you'll be required to personally guarantee the note.

We manage a property that was having drain field issues for awhile, got estimates and had the owner approve one of the vendors.

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

The benefits of Kissimmee for a newbie is analyzing property potential is very easy - you will have a ton of carbon-copy comps to look at and the online estimators like Airdna can actually be pretty accurate. 

Bonita spring way more expensive but less chance of hurricanes( from the last 30 years ) and less opportunity to cashflow.

The two existing LTR units (on my family’s property) were built 5–8 years ago at a cost of about $80,000 per unit, so I’m estimating a 20% increase in costs for the new builds.My plan is to use the equity in the land as the down payment for the construction loan, which I expect will make closing costs the primary upfront expense.

I don't think anyone predicted that.I've always thought for rentals it's better to buy a $250,000 house and hope for the chance it goes to $350,000 than buy a $500,000 house hoping it goes to $750,000. 

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

I have not heard of anyone doing them in years so the chances of finding it would be slim to none.