Well you have come to the right place!! What are you planning? Do you want to go the sump route? What kinds of things do you want to keep in your tank? People are soooo helpful here and you will get a ton of info overload I am sure. I think since I am so new I will leave major bits of advice to the experts, which there are a ton of on here. Here are 2 mistakes I made when I started up and two things that I will I would have sunk WAY more money into.
Mistake #1: I bought a really expensive canister filter. Mistake #2: When I first put up my tank I didn't qt my fish.

Here are the 2 really improtant things I have learned, and trust me there is a TON more then 2
Learned #1: Buy the best protein skimmer you can afford and buy one that is rated for 2 times your tank volume.
Leaned #2: There are SO many benefits to some sort of sump/ refugium (sp?). I will eventually be doing this just not sure how or when

Hope this helps! I am a newbeee Speak up anyone if these are some terrible bits of advice.
Heidi