I'm new to salt as well. I set up a 55 about a month ago from spare parts I had from a freshwater tank I had years ago.
As far as filters I run 2 merineland 350 HOB
filters. One with regular filter cartridges and the other I filled with live rock rubble. They are relatively inexpensive (buy online it's cheaper).
Heater: I think mine is a fluval 200 watt. It's rated for up to 65 gallons. Again not very expensive online.
I bought 50 lbs of dry rock from reefrock.net it was a very good price and you get 40lbs of sand free. Great quality as well (IMO
). I seeded with 5lbs of live rock from LFS
and some reef starter. I added another 15lbs of sand to give me about a 2" base.
I didn't use ammonia or raw shrimp. Just let it stabilize for about a week the added 2 yellow tail damsels to get things going.
That's worked well for me, but there are many different ways to go. The only thing I wish I'd done different is to use different fish. Something like green chromis. The Damsels are kind of aggressive when adding new fish.
Hope that helps.