I have been reading the online resources about getting started, searching the market, and even doing tours, but I am hesitant to jump in and buy a house as I have quite a large amount of student debt.

Sounds like you need to have a relationship with a couple of good contractors, 40k for vinyl siding sounds high, what was the material cost.  

I just wasn't sure if it is my responsibility to do something if the electric bill is high and are not satisfied. do I have to be concerned about that?

If it’s doable financially I’d recommend the duplex.

This site has been instrumental in getting me from 0 properties to where I am today. 

I'd highly recommend attending some local reia meetings.

In my opinion, an in person meetup > an online connection.You may want to consider making a connection here and meeting up for coffee or attending a real estate networking event.Best of luck!

I'm starting a property management company and I'm curious to know how people have marketed themselves online.

Unlike Robert K and many on this site, I judge a property based on total return.  

My recommendation would be to get approved as a Landlord, contact the director's office and request that an inspection be completed before a tenant is selected (sometimes they will do this as long as you select a tenant within 14 days - which you want anyways), and have an online application and screening resource in place.