Husband changing career while expecting

My husband just got a job at a car dealership, but hasn't started yet. He's worked at the same restaurant for a couple of years now and it's not even paying our bills. He wants to forget about the dealership and jump into this real estate company and pay out of pocket for all of the classes and certifications, when I think he should look into places that accept grants.. He's dead set on this company and not looking anywhere else. There's no way that we know how much he would be making from the real estate just starting off. He's gonna do that during the day and work nights at the restaurant, eventually going to bartending. I'm just afraid that it's not gonna get us where we need to be financially. I think there's more opportunity to make money up front at the dealership because they have hourly on top of commission and benefits, though it isn't a career.

We're in our early 20's so it's rough finding a good paying job. I'm just really stressed about finances, and I don't want to end up stuck at his parent's house with a newborn. There's a lot of tension and constant fighting between his parent's, his dad is an alcoholic. The house is really messy, I can't even cook myself meals in the kitchen, let alone have any room in the refrigerator. I'm just not sure how to support him when I feel uneasy about him putting in all this money into something that won't help us for who knows how long.. I'm a student as well but I take all of my classes online so that it doesn't limit my time for work or anything else. He is the main income provider since I've had a very rough pregnancy. I'm worried about having to overwork myself to be making enough money when I'm already so sick.