What do you want to do? What are your interests? I'd guess you're about 23 - so I'd be reluctant to work at a Bill Miller's. Not that it's a job below you, or me, or anyone - but it'll just keep you away from finding exactly what you want to do. You have to be happy in your job.
Look at your church, and see what jobs are available. Volunteer at your church, because a lot of jobs are hired from the volunteers. Talk to your contacts with the Spurs/AT&T Center, and see if there's an internship program you can get into there. The AT&T runs all-year, not just for the Spurs. At a point, you have to chase what you want to do, and if you can do Bill Miller's WHILE you're doing that, great. But if it takes up too much of your time, and doesn't let you pursue what you want, I wouldn't take it. I'd still go to the interview, though.