I've catered my fair share of events but a professional I am not...
I think Charlie was/is, if I remember correctly. And CathyZ in Hawaii was/is too. They were both really helpful when I first started.
I ended up deciding it was too much work to pursue full time. Exhausting! I preferred to cater out of my house only about once a month. Now, of course, I only do events that coincide with my school breaks. (Hubby threatens to leave me if I try to balance school and catering simultaneously!)