While I dont run a skimmer I strongly suggest beginners use skimmers. Often times beginners will overstock and overfeed their tanks and a good skimmer will go a good ways with helping maintain water quality.
What kinds of fish do you want to keep in this tank?
Some additional powerheads would be of benifit to help maintain water current within the tank.
Do you have any thoughts on substrate? I would avocate a DSB
and 100lbs of live rock for your tank along with a good quality skimmer and a sump. You can put your skimmer and heaters within the sump to keep them out of the tank.
While this site and the internet itself is a great resource IMHO
nothing beats a good reference book(s). You can find some helpful saltwater books listed here