As you go through your first year as a resource room teacher, you will gather a lot of ideas and materials from the classroom teachers. Get a 1-2 inch binder to hold your holiday materials. I bought the dividers that are pre-labeled with the months on them. I set up my binder to follow the school year (started with September) and added a few page protectors to the back. I started this binder while student teaching so I had a small collection of materials already. As the year progresses, I make copies of any activity I like. I can easily just stick it in my binder when I get back to my room. I use the page protectors for tracers/examples that can't be hole punched.
PLEASE forget trying to keep all of your materials in page protectors. You will not have time to pull out all the papers every time you need to make copies.
Only collect activities that you really like. You don't have time to do multiple activities per holiday. At the beginning of each month flip through your holiday binder and make copies of anything you will use that month. Do your holiday activities EARLY. If you don't, the classroom teachers will ask you to push in so the students can do their holiday activities. Happy Holidays!