Dont get discouraged, you can still have a small salt water tank. Remember, as long as we learn, we will make mistakes. I think one of the biggest lessons we all learn is that you cant always trust your LFS to have the answers or best advice. Heck, one of our locals gets rude when I ask questions, the only reason we still shop there is decent prices on equipment.
Anyway, if you can afford to add some more lighting, maybe a small power head and give it some time, you could have a small reef. We actually have a 10g that seems to be doing okay with a biowheel and another small filter (Tetra I think) with about the same amount of LR as you and a small power head, but we also have a very small bioload--1 blue damsel, 1 CBS and various hermits and snails. As far as corals--some button polyps, shrooms and a small patch of GSP. We also keep some red macro algae in to help with nutrient export.
Try looking into the Nano Forum for better advice on small tanks. Keep it up and keep us updated if you can and dont be afraid to ask questions, we all want you to succeed. Good luck!