help my film size is 706 MB

HI!!! :o
First of all i am new in all this so...
I am trying to do a little "film", i use monkeyjam (but i am looking for other similar in ubuntu becouse i don't find framework for linux so...) ok i export all the frames to avi, and succes i have my avi but the size is about 706 mb!!!!! is tooo HUGE!
How i can compres o what i can do, is thath in monkey jam or i can use some program in linux to small that

Ps: sorry for my english becouse speak spansh jeje :wink

Thanks for all