Good points. I'd even go further and recommend you draw up an outline of what you're going to play. Bring along a list of songs. I used to plan my shows out in advance—every week—for years. That way you can also plan ahead on what you're going to say about the bands or songs during your breaks. Have some info prepared, like band histories, etc. Do some research on a particular artist and tell a story about them. Not too long, though, but keep it interesting. A lot of people (myself included) don't like to hear a lot of talk on a music show. But short, interesting stories about bands or songs can be fun to both tell and hear over the air.
Another thing I would say is to try and sound like you're into it. I hear SO MANY community radio jocks who sound like they'd rather be anywhere else than where they are. They sound bored, they mumble, they throw in too many "uhs" and "ums," and they're just completely boring to listen to. Get excited, and SOUND excited. Relay the information as if you're telling your best friend about a band you just heard for the first time. Get a co-host if it helps (it usually does), but if you do, don't get sidetracked and start talking about stuff only the two of you understand (like inside jokes, etc.). That's a great way to lose listeners, too.
Always know what bands are coming to town, and don't be afraid to announce and talk about festivals coming up, too. INFORM your listeners. Most of them won't know any of this stuff and will benefit greatly from getting the information from you, and will keep them coming back for more.
