Im really sorry to hear that
i went to my first funeral a few weeks ago, my step dads dad died
and it was really hard,
Just dress nice and greet everyone and say that your sorry and give them a hug or something
best of luck to you man.
Haven't cried in years, but don't want to look like a douche for not crying.
Once you see a corpse, the world changes completely. You get a new way of thinking completely. It's temporary though, you'll forget it eventually. Just hope that's it not at a church or it'll drag on like a bitch.
If it's open casket at the wake/viewing if you are going to that,
You just go up to the casket, and drop your head for a few seconds, close eyes to pretend yer prayin if you don't feel like saying one.
The rest is pretty much just sittin or standing around.