What are you looking to keep? Canister filters are not the best for salt water and you would want a sump. Don't buy stuff new, then research it. Research what you want, then find it used. For your first tank at least. For example, if you want fish only, you could get a power compact fixture cheap, but if you want corals, T5HO is good, and you could get a MH
system used fairly affordably.
Do you live in Jax? You will need about 4 five gallon buckets of sand. Shipping would be insane. Taking Beach sand could be against the law. Many will say its a bad idea as you don't know what pollutants are in the water.
PLEASE read about fishless cycling.