It takes effort to be a good team member.

What lessons can you take away from the teamwork training today that could help you be a more effective team member for the marketing plan assignment?

I have a bachelor's degree on economics, I was a justice student before coming to Canada, I have been a student for almost 20 years of my life and i am 37 (well 38)... I have never been in a teamwork as a student! I see that it is not in my country's education culture. Everytime a teacher says "Teamwork" i tremble from head to toe :) But we know that people get used to many things so i have the hope that i will get used to it before i finish the school :) 

After such a whimpering introduction; what lessons i took away from the teamwork training today? What could help me be a more effective team member for the marketing plan assignment? I have to say it clearly that i figured out that i have to tell my strengths (experiences?) and weaknesses (language?) at the beginning; so that me and my teammates can forsee what is coming... and i am taking the job seriously in one hand; but i should stop exaggerating the presentation on the other hand.