Oh a few other things I remembered from the course I did just a little while ago:
Don't eat too much! You might be scared that you'll be super hungry, only eating before noon. But it's really not that bad, and eating too much at lunch or breakfast can really slow you down for the rest of the day. So keep it moderate!
Sometimes they'll say, "Continue to meditate in the hall, or in your own room if you'd like." If that's the case, I would recommend staying in the hall; I'm not sure if the vibrations are just better there or if it's encouraging to be around other meditators, but I always had a much more successful time in the hall vs. in my own room.
Finally, make sure, like Ben said, to just do exactly what you've been told. I wouldn't worry about not having meditated before - in some ways, that's best, because you don't have all these ideas in your head about what to do!
Gain and loss, status and disgrace,
censure and praise, pleasure and pain:
these conditions among human beings are inconstant,
impermanent, subject to change.
Knowing this, the wise person, mindful,
ponders these changing conditions.
Desirable things don’t charm the mind,
undesirable ones bring no resistance.
His welcoming and rebelling are scattered,
gone to their end,
do not exist.
- Lokavipatti SuttaStuff I write about things.