Refugium Advice

[BMahura]

So i just got my display set up and bought some chaeto and a couple other types of macro algae for a compartment in my sump that i want to turn into a refugium. I dont know much about refugiums and need a little advice. the area is 12" x 16" x 24". I put an inch of sand in but think i might need more.
If you can help me start out my fuge that would be great
Thanks in advanced

Brett