And ALWAYS sign you rep with your NBF username in the comment field so your receipient knows who gave them the rep.
Oh, don't even try to give out negative reps and leave the comment field blank or use someone else user name, the mods can go behind the scenes and find out who sent it - not that i am implying you would try it, just passing a general warning to all the people.
So get your > 100 posts and have FUN with the reps....