Congratulations!
My advice is you must *not* be afraid to fight. Don't avoid arguments because they make you feel bad. If you argue the correct way they can help you grow in your relationship. Don't go in circles and actually listen to each other, and try to find a way or make a plan to resolve the root problem or whatever is causing the fights. Just ignoring the problem will let it fester and make the eventual conflict much more dramatic than it needs to be. That being said, don't go *looking* for a fight. Don't purposely try to provoke a petty squabble over a minor annoyance or take out frustrations from other sources on her. What your boss said that day doesn't need to affect how you feel towards her. Also, stay focused on the problem the fight is about, don't let it spiral down into name calling and pointless ad hominem.
Fighting is ok. Just have good fighting etiquette and use the fights as a way to work towards a solution rather than as a way to tear each other down.
Also I doubt we're able to submit two bits of advice but this one is also very important so I want to throw it in anyways. Taking care of finances is very important! Statistically, this is what splits most couples. Be honest and open about your spending and have a budget both of you can agree to. Money can't buy happiness, but it sure as hell relieves a lot of stress!
Good advise my friend. I'll add the following: NEVER go to bed angry and deal with the problems as they arise. Let it be known from the beginning... No mind games. If you want or need something, make it clear. A belief in God is a good thing to have when things get rough in the marriage. My two cents. Don't count me in for this PIF, but congratulations to you and your future wife. What a generous PIF!