I'm always very hesitant about offering any advice regarding marriage - please understand that I'm a new wife myself; we've only been married for two years, and we're both imperfect human beings with our failings and faults. But, from the limited experience I do have, I'll try to share a few points.
I assume that you and your young man have already been seeing each other for a while, feel comfortable around each other, and respect and trust each other - otherwise you probably wouldn't be thinking of marriage at all.
I think the first, and very important question to be asked, is whether the two of you have the same long-term goals regarding how both of you view your future life, and in particular marriage and family. How does each of you define the roles of husband and wife in marriage? How do you imagine children entering your family, and how would you like to raise them?
There are couples who feel they are very well-suited when they are dating, but later their marriages fall apart because one of the spouses believes in a husband's leadership and the other doesn't, or because one of the spouses is open to the gift of life and children, and the other isn't. I know a couple where the husband bore a deep emotional wound because his wife was not ready to have another child, however he asked. I realize people change as years go by, and what seems acceptable now may look different in, say, five years, but if you're on the same page now that's still saying something.
What sort of lifestyle do you envision for your future family? Do you want to live in the city, suburbs, country, near to one or both sets of your parents? Do you think you might wish to homeschool your children? My husband expressed his interest in homeschooling on something like our third or fourth date, and just so you understand, this is generally very unacceptable in Israel so it helped to know that at least in theory, we're both comfortable with the idea of being "those weirdos" wherever our family happens to live.
How do you like your future in-laws? It may not seem that significant right now, but the fact is, the two of you will not just be starting a new family, you will also be marrying into existing families. I've been blessed with the most wonderful in-laws you can imagine. My husband's parents have open hearts and had immediately accepted me as one of their own daughters. All his siblings are very special, precious people whom I admire and love to be around. But I also know of marriages where great strain was placed on the couple because of tactless interference, nosing around, poisoning the husband and wife against each other, all done by the people who are supposed to love them both. I believe it's very important to put some distance between your parents and your new family, and make it clear from the start that you are paving your own way. If you and your future husband don't see eye to eye regarding his and your family issues, it may be a problem.
How would you handle finances? Do you agree on what you consider basic necessities for your family, and what you consider luxuries you can do without? Are both of you financially responsible, are you ready to live frugally if need be? Money may become a huge stress-maker if one of the spouses is sensibly frugal and the other is more of a spender.
Is your boyfriend happy with the idea of his future wife being a homemaker? Does he see the importance of a wife and/or mother at home? Are both of you willing to make sacrifices to make this possible, if need be, and to withstand social pressure? Does he realize the responsibility of a husband as a leader of his family and a role model for his children?
These are just a few questions I believe you should ponder, and also discuss with your young man. Some of these, of course, you may have thought of already. Above all, I believe you should pray for Godly providence and guidance in this very crucial matter of tying your life together with the life of your husband.
To wives who have more experience than myself: your thoughts and input on this matter will be welcome and very much appreciated!