I was married young - age 19. And, I was nowhere near ready to have children after only 10 months of marriage.
I believe it is OK to go to your husband and let him know your heart's desires. If going back to school is one of them while waiting to have children, it's not a bad thing to ask your husband to support you in.
How much say does my husband have in this?
Where it could be a problem is, you saying you're going to do this without thoroughly talking through what this will look like for your marriage and at home time. Does it mean going during the day, or going at night?
It does need to be a mutual decision between the two of you. Not a decision he alone makes.
If he wants children now, should I have them now?
If after only 10 months of marriage, you're not ready for children, that is perfectly understandable. It's important to be "married" and working on making your relationship stronger before children come.
Again, this is a decision to be carefully prayed about and worked through together. If you want to wait awhile longer, it that a huge issue between you?
In your heart is there an issue with submission? It's a dirty word amongst Christian women. What scripture tell us is,
we must submit to one another out of reverance for Christ. (Ephesians 5:21) There's always a lot of discussion about this in Christendom and it carries a full spectrum of heated argument. Becoming more Christlike is our ultimate challenge and serving each other instead of ourselves. I've come to understand this truly means listening to my husband's heart and to The Holy Spirit for my guidance (not always my pastor).
Do you mean does he have the final word?
Not necessarily, I believe He needs to seek God's wisdom in this decision.
Again, scripture tells him to love you more than he loves his own body. (Ephesians 4:28) That doesn't mean demanding his own way.
But you also need to consider, will your decision be honoring and respectful to him? If that means waiting to go to school, and that is what he is truly asking of you - then that is something to earnestly pray about. There have been times when my husband has felt very strongly about something - we've both needed time to process this, to where I have decided it's not worth the disrepect to my husband so that I can win. That's not my ultimate goal in my marriage. And, sometimes over a period of time, he has come back to me to say "go ahead, I'm at peace about this." For me, it's been an issue of learning to trust God and that he does work through my husband's decisions and will bring honor to me and to our marriage when I sit back and trust in them.
Has this happened overnight that I've gotten to this place? No. It's been a long hard process of many arguments and doing things my own way, only to learn that I was not doing a very good job of respecting my husband or trusting God to work through him.
If I am at peace about a decision, I know God is involved. If I am still undecided and in turmoil, I need to spend more time in prayer and wait for God's guidance.