Here is how I did it. When I decided to play again, I joined a community band. Now I had contact with about 50 other musicians. Some of them were playing out for money. You might get lucky and be in a good band but if not, there is a big overlap between bands. If your good, you will be asked to join another band. This is all still for free so far but, necessary. Someone in the band or bands will play in a local swing band. Sooner or later they will need a sub for a rehearsal. That's your chance. As said above, Churches are a big source of income. Go to a church service. This might cost a little if you put money in the plate. After the service, go to the organist and talk. Sometimes the organist it hidden in a loft so that's a bad church to try this. Tell the organist that you play the trumpet and ask if you could play along with some hymns next Sunday. If He/She says no I'll be surprised. Organists usually belong to some kind of organist guild that includes a ton of churches and they do talk. Go to the Jr. H.S. and talk to the band teacher about giving lessons. Parents love it if you can teach at the students house. Believe it or not, teaching will help your own playing. Here is your problem as I see it. This all takes time and you're a student. You have to go to school and learn and start for free. Learning is really important. It might be quicker to get a job at the local pharmacy.