As soon as I got it, I reached out to the HOA management company with my deed and started paying my monthly assessments. 

My name is Vlad  and I’m excited to join this group as a rookie real estate investor.

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It only applies to residents living in Jerome Village so for investors, it would only apply to rental income from Jerome Village properties, not your entire portfolio or out-of-state income.

Just trying to find out how to secure remaining 20% for seller

These are the keywords that stand out to me in your question:sources, websites, best deals, systems, step by step, factors.You are focused on all of the wrong things.

This seems to be a sticking point.  

Since we are out of state, we have to lean on a lot of information from y'all!

Happy to discuss this further if you want to reach out. 

Specifically in SC, though, I would check two things - 1) see if the ATI exemption applies and actually quote the taxes for that particular property on the county tax estimator tool, and 2) get a ballpark quote from your insurance partner on the particular property.