Welcome to The Reef Tank
Ask away! We can handle it

The only bad questions are the ones that don't get asked. The more you know the healthier your tank, animals and wallet will be.
The first question I have for you is are you already set up with the 55 tank and stand? If not, I'd consider a 75 if I were you (been there, done that with a 55) and if space permits. The added space inside the tank, especially the depth from front to back will make such a difference and the costs won't be that much higher.
The lighting you will need will depend on the corals you want to keep. If you are going to do only soft corals, you can run VHO (Very High Output) florescent lighting. If you want to eventually get in to hard corals and clams, you'll need Metal Halide (MH) lighting. You can do the MH lighting with soft corals, too. It really depends on what you think you will need and what fits your budget. Either way, you can get lighting for under $1000 if you are a good shopper
VHO= Icecap 660 ballast $160-190
4 VHO bulbs= $100-120
asst fittings and end caps=$100 or so
MH dual ballast= $150-190
2 bulbs= $120-190
asst paraphenalia $100-150
This is just a rough idea; you can go VHO and MH with an Icecap 440 ballast and two actinic (blue bulbs) or even go for a cheaper florescent outfit if you are running Metal Halides with them. Buying used ballasts can save you $$ too.
Lighting is one of the trickiest parts of this hobby, it's like fitting a puzzle together. Research what animals you want to keep and then we can tailor someting a little more specific.
Alice