Help on jailbreaking ipod touch 4g? (4.2 software)?

Firstly, can I jailbreak my ipod when it has 4.0.2 software or do I have to downgrade? Which jailbreak should I use? (For example. LimeRa1n , RedSn0w, Spirit)
Also, how do I jailbreak my ipod touch so that I have a constant stream of internet. I want this for free, and I don't care for wireless calling, I just want internet access wherever I go.
I know that its possible, I just don't know how.
If available, can I get a link to a self help site? I'm having a hard time finding one. THANKS (:
 
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