How much does it cost to start an LLC in NJ?

I need a step by step dumb-proof list on how to start an LLC for my website and how to pay taxes for it... i've never done anything like it and i have no idea how to... someone was charging me $600 to do it for me and thats nuts. soemone said if i do it myself it should be under $100 or so. what websites do i go to? what do those questions mean and how much will the absolute total cost be? and how much are the taxes i'm supposed to pay? 7% on each sell or what?