I was married for almost 5 years, and left her at the beginning of this year. Some things I've learned is:
1. Don't let yourself be pressured into following through with the ceremony. Be responsible for your destiny. If it doesn't feel right, don't do it.
2. Listen, observe, and act. Listen to what she's saying, observe her body language so you can know what she's feeling even when she won't talk, and act if she needs help or understanding and can't ask for it.
3. Become connected as a married couple, but still maintain your sense of self. Don't give up things because you think it will make her happier. For example, if she doesn't like you camping with your friends and being away from her, try to include her on a trip with just the two of you so she'll feel like she's a part of it.
4. Do things together (see above).
5. Let her have her hobbies, and let her do something that gives her worth and reinforces her value to you. She'll be happier, and that means you'll be happier.
6. Wait a little bit before having children. And don't think if your marriage is failing that the solution is to conceive a child.
7. Know when to go at your own pace that you're comfortable with, and know when to push yourself to move forward with her. Life is sometimes worth taking the risks. You can't live unless you really live.
8. Be prepared to "die to yourself" on some things. For some reason, every woman I've talked to wants their man to do stupid crap with them because it makes them feel like they're spending time with you. So next time she asks you to go to the grocery store with her and it's your only day off, just bite the bullet and show her you care.
I dunno. I guess I'm not the best advice giver, but these are some things I saw in my ex and saw in me. Best of luck Fish!