Lots of good advice so I'll just add a pet peeve of mine. Foul language has no place when dealing with inquiries. When I respond to potential customers, I don't know if they're a 20 year old sailor or a 12 year old kid. Cut out profanity, at least until the other person breaks the ice with a swear or two themselves. Even when they do though, it's not very professional to respond in kind. It's kind of funny when I get a swear laden inquiry. I'll respond with a couple "gosh darns" and watch their next message be devoid of curses. Respect breeds respect.