STR insurance provides broader coverage, including liability, property damage (even non-guest-related), and gaps Aircover might not cover.For damages caused by guests, document everything (photos, receipts, estimates) and file a claim through Airbnb.

So multiple eyes and local expert providing local cost and input on lifespan.Here is an example that has a part that is more expensive in my market than other markets (unlike most parts that are the same everywhere, so in this case your cost should be significantly less due to both cheaper part and cheaper labor): $1600 40 gal water heater installed (this is good price for a plumber, a little high for a handyman) with expected life of 12 years (i have some that go 20 years and some that die in less that 10 years (mostly rheem die in less than 10 years), 12 years is fair life expectation

I than let them know my top choices for PM/TP provider in that specific market, not just my own but whoever I see as current best, and what there rates are.     

Just note that if you want to put the property into an LLC and have a mortgage on it, you will need to talk with your provider to see if this is possible without refinancing.

Regarding a HELOC, most banks will only provide a HELOC up to 75-80% of the property value, so you may not be able to access a HELOC for a while.

It is now paid for, is worth triple my purchase price, and provides about $60K a year in rents.  

In the meantime, I would like to gain experience through employment with an existing real estate or property management company.Is there anyone out there that can provide me with some good advice/guidance as to the best and most practical route to achieve that goal?

These areas tend to attract high-quality tenants and provide consistent passive income, which is a great foundation for building your portfolio.If you’d like, I’d be happy to share some insights about these types of markets and why they’re appealing to investors.

After wanting them to sign something they never provided it! 

You can't decide which one to choose based on the minimal information you provided.