The best advice I can give is to just go and keep going. You'll learn the lay of the land and get comfortable with the sessionn just through being there. And other people will get used to you being there the same way
What Amy said.
Go in and skate and be serious about your skating. Don't go in looking to be included in all the 'reindeer games'. Learn the patterns for moves and pay attention to who is skating. Don't hog a corner or a circle. Know where the lutz corners, harness alley and spin areas are. Keep your eyes up so you don't skate into people. Don't skate backwards without looking over your shoulder. Don't interrupt a lesson. Don't interrupt another skater's practice to ask them how they do 'x'.
I assume you're a teen or you wouldn't ask this question. But if you're an adult, same-o same-o.
I was on freestyle from the time I was in Beta after the skating director realized I had eyes in the back of my head (thanks to residual horse show reflexes). Being able to stay out of other skaters' way seems to be a core skill for newbies to have. Also no hogging is valued (people
HATE that--don't hang out in your 'safe' area). My skating is still clearly beginner level (stupid injuries) but I've never had any issues with other skaters (and I share ice with National level skaters--no one famous).