Welcome to the forum, Kennedyjp30! You will find lots of help on this forum to guide you in the right direction.
The best piece of advice I can give you is to be patient. Nothing good ever happens in a hurry when it comes to saltwater. It is a long, slow process to develop the tank of your dreams. This isn't the show "Tanked" where you can throw a tank up and fill it to the rim with livestock in one day. This is a real life situation... with real life consequences. Nature operates with a balance to all things, and you are trying to create a piece of the ocean inside a glass box. The only way it will ever be successful is if there is balance. The tank must be prepped properly by allowing the nitrogen cycle to run it's course. Once that's done, it must be stocked s-l-o-w-l-y to allow beneficial bacteria to populate enough to handle the additional load. You must have enough area for this beneficial bacteria to live, such as adequate sand and rocks. There are other methods of creating living areas for this bacteria, but I find that the natural approach works best. 1 - 1 1/2 lbs of live sand and 1 - 1 1/2 lbs of live rock per gallon of water will provide enough natural filtration to handle a fairly well stocked tank...
eventually. You'll still have to perform water changes to keep Nitrates at an acceptable level, but there's a solution for that as well. If you add a sump with a refugium, you can add macro algae to the refugium. Macro algae consumes Nitrate, and can help reduce water changes considerably.
Sadly, the Fluval is good for a fish-only tank, but not so much for corals. I fell for the Marineland "Reef Capable" LED, so don't feel bad. I started with metal halides and power compacts, but after researching LED's and realizing I couldn't afford a good fixture, I switched to T5 HO lighting. Uses more electricity than LED's, but less than MH/PC. I've had great success with these lights. LED's are making good strides in the right direction, but there's still a ways to go before "high-tech" lighting becomes affordable to main-stream users. I have too much invested in my tank to risk using a hit-or-miss LED. They are NOT created equally. The only LED's I would even consider are beyond my reach...