how can i be completely annymos

How can i stay invisable on the internet so that not even the fbi can find me. I use tor and use simple browsers like w3m. I use cgi proxys. I dont use my normal email or anything else when i do this that could link me to anything. what else can i do? what should i read about? any links or books i should read?

ill have to read up on MACs i thought those where only used in wireless. your MAC is shown when you use TOR? I assumed that if they where not watching you it would be invisible using TOR.

how do they know your MAC anyways is that sent to your ISP?