I want to make sure I find someone trustworthy who’ll handle everything from tenant screening to maintenance, but I also don’t want to end up with hidden fees or unexpected issues down the road.Have any of you had experience using property management firms?

If you family considers you a trustworthy and responsible person, you can likely get a deal like that together. 

To keep your property safe during vacancy the best bet is limit vacancy.  

You name it, I likely have someone trustworthy.  

My plan is to build a trustworthy network on the ground, but looking for referrals from experienced investors. 

Institutional lenders will not give a first timer 100% financing, you could bring on an equity partner into the deal which would be your best bet. 

Based on what I plugged into the BiggerPockets Calculator if I wanted to profit $25,000 and there was $70k in repairs it said max allowable was $78,000 so I actually told them $65,000-$70,000.Fortunately, you're in a city with a strong investor presence.I recommend you reach out to one of the many local real estate investor associations (google "Charleston REIA") for solid contractor recommendations.I'll bet someone good would do it for a couple hundred bucks.I'll just say this about using anyone's calculator: You need to understand the assumptions behind it. 

(I'm betting the seller is asking for top dollar.)What do you estimate your cash-on-cash return to be? 

I personally (and professionally) think looking inside of 465 is a great bet!

Initially, I believed investing in multifamily properties would be my best bet for maximizing cash flow and minimizing vacancy risks, but they are scarce and expensive.