What is a good starting place for an estimate to completely overhaul the interior of each 900 sq ft 3br/1ba unit as current tenants move out? 

Alongside my studies, I am deeply interested in starting a career in real estate.

How much would I have to increase my price point to start finding viable properties in B-class neighborhoods?

Side note, I'm on my way to get my Real Estate License, just passed the exam and starting the interview process with different companies hoping to find the right one .

Start a new service?

If they put up any sort of resistance, that could be a cue to start digging a little deeper and documenting a bit more thoroughly (hence the doorbell camera coverage tip I put first - installing the cameras right away and then having the new lease conversation with the tenants afterward is very easy to frame as "I'm just a new owner putting some TLC into the property and doing my due diligence on the leases/tenants"; talking to your residents first, finding out they have extra people living there who aren't on the lease, and then installing cameras around the property could set you up for a very adversarial relationship with your inherited tenants). 

I just started up with them, and I am wondering if I will make even one deal.  

Starting so young is one of the best things you can do, but so is hanging out in the right groups with people that have similar goals.

Best of luck starting out. 

A lot of people with growing portfolios start to look at a true property management software.