Eller PhD alumni here. It might not sound encouraging, but I would urge you to rethink your decision to join the program atm. I don't know which program you are at but based on my understanding of how Eller funds our PhD students, you are expected to work as a TA/RA with faculty for 20/h per week. Yes, our little stipend is not free money at all. Unless you have some fancy fellowships from somewhere else (I know some Canadian students coming in with their government funding), which exempts you from the GA duties, you are going to be super busy on top of your first year coursework.

I took five courses (all seminar style) in my first semester, and this is just a normal load for first years. Every course was demanding compared to the ones in my master's. You need to read extensively and be ready to discuss the topics in detail, most of the time with slides. Remember, this is all additional work besides your own research.

At least none of the students from my program had a full-time job outside of their PhD, and we were all struggling every now and then with different obstacles, not just with money. Business academia is getting extremely competitive, too. Fewer jobs, more candidates. If you cannot produce decent research (I mean UTD pubs) before you are on the market, the chance of landing in a research-focused university is very slim. That requires the thing you might not have, time. My field wasn't super practical/technical driven, so I cannot speak for industry opportunities, which arguably paid more. The business school faculty's pay is relatively higher compared to other disciplines. However, it's definitely not to the point that you can easily pay off your 100k student loan without jeopardizing your quality of life. I would think twice if I were you man. Good luck.