The more records you put out, the more people will like you. Naturally, this means writing as many songs as you can. I recommend setting up a tape recorder, taking in a 12-pack of beer, noodling around on your guitar, drinking a few more beers, and then waking up a few days later and listening to what you did. There may be some good songs there. This is a big one.
Bands are like beers.
Once you've been through one, you want another. And you can't drink Bud all the time. Sometimes you have to switch it up. Go with a Guinness or a Harp. Maybe a Heineken once in a while.