For the First Seminole war use conquest/Old glory seminoles and War of 1812 Brigade Games us infantry/artillery.
For the Second Seminole war use the same seminole manufacturers and Boot Hill miniatures.
Us deserters are in the proper uniform and New Orleans Greys will do for miitia units involved.
Also any civilian from BH will be ok again for non uniformed militia units and volunteers.
You can paint the BH miniatures the same way for the Texan War of Independence, comanche squirmishes, Second Seminole War.