Sounds to me like you've got a great start in this hobby! I basically started the same way, a hand-me-down custom 135, with a canister filter and a crappy 2 bulb t12 hood.
New that I wanted salt even though, I've never even had a freshwater tank.
7+ years later, I have a beautiful 180g full reef system ( Craigslist score,but had to build overflows and all filtration) that my whole family, is proud of!
I am also new to AA, to have this site to help steer you on the right path, from the start, as opposed to trusting the guys at the various LFS
, who are generally out to just sell stuff, until you develop some friendships, should help you immensely
Good luck in your saltwater endeavor, Ohh...by the way...careful it's addictive!!