Sorry TS but everyone is looking to be spoon fed around here and messing with these things requires you to do some reading up before you start - or you'll c o c k up.
Start by learning about SHSH blobs and how you can find out using TinyUmbrella whether you have SHSH blobs for any of the more recent firmwares stored centrally. If you don't need to unlock updating fw and jailbreaking is a simple walk in the park - as you'll soon learn from reading up a bit.