Congrats :D I may just be expecting myself, thanks to an unnamed asshole who already has one child.
Best advice: When your girlfriend gets into her sixth month, I don't give a fuck if the nearest 24-hour convienence store is 40 miles away. You get her the damned spinach ice cream. And be quick about it. Or she will kill you.
Next best advice: Invest in a wrist brace for after the birth. You're going to need it if she's holding your hand. I've been too many of my friends' coaches not to know that.
More great advice: Get two jobs. You're going to need all the money you can get. And gently used baby clothing stores are the shiznit. Cheap clothes that you can return (if they're not distroyed) and get your money back after a week when the baby grows out of them.
Relationship advice: Give your girlfriend a break every now and then, even if you are tired. She's more tired, I can guarantee. Kids are NO picnic. And she'll probably be showering frequently to get the baby food out of various places of her body.
Baby advice: They like shiny things. They will hide all of your most expensive jewelry in couch cushions and in heating vents.
Names for girls:
Johanna Maybell (something normal)
Stardust Moonbeam (cosmic)
Jersey Dallas (for travelers)
Names for boys:
Jesse Michael (normal)
Saturn Orion (cosmic)
Phoenix Seattle (travelers)
These are all names I've considered for my own kids. I especially like the cosmic ones :)
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Mediocrity at its most average.