Hi Cari; welcome to The Reef Tank
As for lighting, you'll probably want more. I used to run 4 110 watt Very High Output (VHO) florescents over my 55. I'm wondering how much room is left under the canopy of the bowfront? I think your best bet would be a pair of 250 watt metal halides. You could keep anything you wanted that way and they'd not take as much room as more florescents.
As for your phosphate levels, are you using tapwater? If so, an RO/DI or other water purification system would be in order before going reef. High phosphates can also be the result of processed fish foods, especially flake food.
You've probably got about as many fish as I would add in a 72 gallon reef, although you could maybe add a couple of small gobies or blennies for interest and color.
Read, read, read is as good advice as any. Take a look at other tanks about the size of yours and see what they are using for equipment. Take all that information and then turn your system into one that works for you and the animals you want to keep.
Have fun!
Alice