How can I approach this guy?

I'm really attracted this guy I always see getting food at my work place at my college (I work on campus). I think he's completely my type, but I'm not sure if i'm his? I'm a bit chubby and so is he, but he seems pretty popular with the girls here. All I know about him is that he wants to be a pastor from my coworkers who do know him a bit. He usually seems off into his own world when I glance at him. I want to make conversation with him but I wouldn't know what to say. I've been told i'm pretty and funny from guys that I've dated. But I feel like a coward and not really confident, for this guy. What should I do? I'm nervous he won't like me.
How can I approach this guy?
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