Hello all. I've decided to give Bitcoin a try. As a test, I want to see if I can make $1 USD from selling a picture. According to
this, 500 Bitcoins should roughly be a dollar (after PayPal fees), right? If I understand this correctly, I should be told the Bitcoin Address of anyone who Sends me Bitcoins, right? And you have the ability to attach messages to the Send? If so, then I guess I could Send 0 Bitcoins in return, with a message containing a download link for the full image. Is this how things are supposed to work, or am I mistaken?
Unfortunately you can't attach a message when you send to a Bitcoin address. It's possible only when sending to an IP. Sending 0 coins is also not possible.
If you want to track payments, you can give a new Bitcoin address to each customer. How to make a new address: Options -> Change your address. We could perhaps make this easier by adding next to "Send Coins" a button "Receive Coins", which would create you the new address and ask for its label.