Guys the nature of the transaction it's not an urgent matter, all you need to know is that there's nothing illegal going on.
I tried registering on coinbase but they asked me to send my ID card photos 5 times and 5 times I got refused so I was annoyed of this and quitted.
Is localbitcoin easier and faster to do?
I don't know why he accepts only bitcoins, but he also mentions on his page that he's going to accept only BCs.

edit: I registered on localBC. Questions:
1) the guy wants me to send 100 dollars, but I'm in EU. Should I buy 100 dollars or 100 euros? Is AMD the US dollar?
2) how can I make the 100$ go to him ?

guys can one of you make this 100$ bitcoin transfer in my place? Than I'll give you 100$ via paypal.

Hi Eretik and ETFbitcoin! Could (one of) you please write me in PM just for a minute?

Hi guys
I'm in touch with a seller who accepts only bitcoins. He asked me to pay dollars to his bitcoin address, and he gave me  a alphanumeric address. I have neither any bitcoin nor a bitcoin wallet.
The question is: How can I send money from my bank account for example to his bitcoin address?
I'd like to have some sort of step by step guide