You can certainly do it, but the variable is the size and type of SW
aquarium you,want. If I were starting in SW
at your age, I would suggest investigating nano aquariums up to 40 gallon. The NUVO for instance is pretty well setup and makes a beautiful aquarium. Or you can do a DIY type setup.
As some fish you might be able to collect are suitable for a smaller aquarium, most of them won't be. I would suggest starting with easy to keep, inexpensive fish then graduate to corals along the way. It is really easy to get in a hurry and trash the money you invest in life stock, so be patient and start slow.
Good luck to you!
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