K.B.
Is he working at all while he's going to school? Are you paying for his school? It seems like he can also work while going to school. He's not 18 and as you said, this is his second degree.
I continue to be amazed that there are so many women out there who are working and raising kids and allowing their men to "follow their dreams," or quit their full time job because its "too stressful." I just can't help wondering how men became our other children. I'd just love to quit my job and become an actress or an artist. I've always wanted to do that, but I know realistically that I can't do that and be a responsible mother at the same time. So, I work a job that I know isn't my passion but it pays the bills and provides great health insurance. Meanwhile I feed my true passion by painting in my spare time and community theater. This is practical. A keyword that many men seem to be missing here. Yes its wonderful to support his dreams but meanwhile there are real-life issues that also need to be taken care of.
Since you're living together and already have a child together it seems to me that the marriage is technically already taking place. Sealing the deal with a marriage certificate and a ceremony is all you have left to do.
Have you researched what kind of salary you can expect for a head coach in wrestling? Realistically, can he expect to be hired somewhere once he gets his degree? Will he probably have to start out as an assitant coach? Are there a plentitude of these types of jobs available? Typically a coach works at the school as a teacher as well so I gather he's at least working towards his certificate in education? At any rate, depending upon how much you make and how much he may make, it may not even be feasible for you to quit your job. But at least your husband will have been able to follow his dream.
Also, have you tried sitting down and asking "How do you feel about me quitting my job once you get yours?" Wait for an answer and really talk about it. Don't just say off the cuff, "you know, since I'm sacrificing alot here, I expect that I get to quit my job once you start working." You probably won't get a response to that. That will just register as "nagging" and go in one ear and out the other. I would ask him specifically how he feels about that.
Also, sit down and tell him how you feel about his treatment of your daughter. He doesn't necessarily have to play Barbies with her but he should be talking to her, asking her questions, telling her jokes, anything that shows attention.