It sounds like you guys have a lot on your plate. I know it is inconvenient not to have family nearby as a support network, but I still think that in the long run, it is better. It forces you to handle your own challenges and make your own sacrifices, which makes you stonger and more dedicated as a couple and as parents. Our premarital counselor advised us not to depend on relatives, and geographical separation kind of forced us into that advice anyway. I don't regret it. We had a lot of hardships early on (especially finances), but they passed. Young couples we knew who depended on their parents for support (especially housing and childcare) just ended up trapped in that situation and never really gained their independence - which is an important part of marriage. (Of course, you've got to do what you've got to do; I'm just saying that if you can manage it independently, I think that's best.)
My husband and I chose to finish our education before having kids. Some people wait until their children are older and in school. I did have classmates with young children, but none of them succeeded. I know it's very hard. I had a close friend who spent nine years getting her degree, because the demands of working and parenting left little time and money to make progress on her degree. I always wondered why she didn't just wait until her son was in school and get it done in four years; trying to juggle it all at once didn't help her graduate any faster or cheaper.
But you know the dynamics of your family. If you budget your time and money as a couple so the children are cared for, the bills are paid, and you can attend class and study enough to succeed, then that's an option. But if the budget is tight, or you're prone to distractions (like gaming), it may not be. Children need quality time with their caretaker, not just basic needs. Whichever parent is with them the most needs to provide that.