Hold off on the skimmer to start off with. If you are going reef, you will need one, but while you cycle the tank you don't want to run the skimmer anyway. Just hold off until you get the tank and start to cycle. Use that time to research your equipment, like the skimmer. I personally would recommend not using a canister for a reef and go towards a sump setup. This will give you a place for your skimmer to go and the ability to put in a refugium, which will play the roll of your canister. This all gives you an easy way to tun carbon and GFO
as well, though I perfer it to be run through reactors to maximize their effectiveness.