Hi Josh,
Welcome to TONMO.com!
There are a couple of articles under Ceph Care that will answer some of your questions. Go to
http://www.tonmo.com/cephcare/cephcarejump.php
and read the Checklist and the Equipment List.
You're well on your way with a 55 gallon tank - we now think that 30 gallons is too small for an adult bimac to be comfortable in.
I discovered that my bimac, when she became large enough, had her own ideas about aquascaping, and changed what I started with considerably. But you will need good pieces of live rock, various sizes and shapes.
You need to determine where you will get the food for your bimac - it's easier for people who live near the coast to keep a supply of live food. Otherwise, what does your fish market offer?
Anyway, those are some things to start with. Read both articles and come back with more questions!
Nancy