In NJ, if you're a licensed contractor, you can do fire alarm. Or I should say, "permitted" to do fire alarm. Just like as a PE I'm "permitted" to sign off on a bridge design. I shouldn't, but I'm permitted. Once, anyway. That said, you could try joining the
Louisiana AFAA, attend their meetings and get started on learning the trade. It's a hike for you going into Baton Rouge, but I don't know how far is too far in your neck of the woods. Always start with small jobs, and cultivate a vendor rep who can help you out. Silent Knight is a pretty good brand, but reps can vary in quality.