Whoa! Congratulations!
I don't even have a girlfriend so I don't really have anything smart to say...
But from what I saw with work colleagues, and other family members who's married and have kids...
Please never forget that your wife and kids are a person, not a pet, not a trophy. Please be open to learning new things and not be scared to acknowledge mistakes (for every party).
Having a family is something really important in life that's not learned in school, must be experienced, studied, and do on-the-fly.
I've seen family members who really cares their kids... Their kids are not allowed to experience tons of stuff and voice their own mind (because parents knows best)....
Or the husband/wife want to do good stuff for the wife/husband but it turns bad... These "small misunderstanding" keeps piling ut.... Until one day, the perspective of each party become so skewed, so everything each party says or do (or didn't do) become corrupted.
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Btw according to Homer Simpson, to be a good husband you need to have this skill
"nod and humm when the wife talks"
Edit: b3d doesn't support smileys from keyboard