You can order them online or pick one up in some Lowes stores.

I have access to all the documentation online and Wayne has been very forthcoming with answers to all my questions. 

If you use an online mortgage payoff calculator with $280,000 at 4.8% for 29 more years, paying $2000 extra principal per month, which is less than the $30K extra you say you'll pay annually with your line of credit, says your mortgage will be shortened by 21 years and save you approx $178,700. 

No, not even if you are paying all cash like some people would incorrectly say.It's entirely possible to earn a double-digit IRR on a 5-cap property. 

Is there a good option for tenants to pay online without me setting up my own website?

It basically comes down to what return you can earn investing real estate and what your interest rate is.If your interest rate is 7 percent and you can earn 12 percent doing REI is it worth it?

I did none of it online as Zillow is a joke when it comes to rental rates in my area.

If you are comfortable with a property a plane ride away then your predicament is just a math problem to determine where your money/ equity earns a better return. 

I have access to the full deed database online in my county. 

However, I still expect average occupancy rate of 80 - 90% is very much possible.On average as an investor, I would expect to earn between 8 - 12% ROI, if you are doing everything right.All the best!