Download Multibit, its a desktop client, and create a wallet. A wallet is 30 letters and numbers. Buy some bitcoins or an exchange, or from someone you know, and have them sent to that wallet. Then, send the coins by sending them to the seller's 30 digit code. Its really easy.

Get yourself a bitcoin wallet (download multibit). you will then get a bitcoin address. This is the address that you send and receive bitcoin from. If you want a few free Bitcoin, give Bitcoinreward a try so you can see how it all works!

you can purchase bitcoins and then use them to pay for the item

I have to pay for 1 purchase over Bitcoin only and i don't plan on using it regularly, its just that the 1 thing im buying only accepts Bitcoin payments. Ive been researching Bitcoin and to be honest i totally do not understand it at all. Can someone help me, how do i Ssimply just pay for one thing which i havve the reciept code for, I can't even make an account on there, I can't find it. I just want to get it done quickly. Thanks!