compression

i want to be a producer so i am developing myself.but it is too diffucult to learn without teacher.i am studying after effect, learnt a lot of thing thank to creative cow.i have a problem. i am a home user and i havent a mac. i use windows.i dont know how do compress.i download sorenson squeeze. its site said that support avi and wmv but i didnt imported these formats.which way best for compression? is sorenson squeeze enough? how am i render from after effect? and give me some information about hd please... this is not my main language so iam sorry about error in this article.:D maybe i am a teen ability. :D