You are joining a established tripping crew.  They have a way of doing things and you should try to fit to there tripping stile at least for the first trip. You need to talk to them and ask the following.
1 Where do I pack my gear ( my own pack or do we put more than one persons gear in one pack)?
2 How many trips across a portage do each of you do?
3 How many times will we move camp ( some where between every day and never)?
4 Do they have tent space for you?
5 Do we each bring our own food? Do I bring any food?
6 Do they set a weight limit or what did your pack weigh last year?
7 How many days do you spend fishing all day?
8 How do you keep your clean clothes dry.
9
10

Can others help me with questions?

You will need to know the answer to these question to answer your question. For instant if they say they single portage you will need to slim your gear down to single ply tp because they will expect you to carry your pack and the food pack so they can carry the canoe and there gear pack.  On the other hand if they triple portage add a camp stool.

PJ’s suggested list is a good place to start.  Most people take too much. The best way to avoid this is to talk to the people you are going with. They know the type of trip they are going on.
Magicpaddler.