I'm relatively new to all of this as well. However, during the past couple of months while I have been making alterations to the house, I have been reading these forums incessantly and watching YouTube.
I would highly recommend you find BRStv, and watch the 52 Weeks of Reefing series. Like...every episode. They will discuss what is needed and what is not, what brands offer what benefits. Electricity, plumbing, setting up a sump...you name it.
You will save yourself a lot of time and money if you know what you need and why BEFORE you start ordering things. Just as an example that may or may not apply to you... Suppose you buy that heater, but you don't know how many watts it should be. Then you drill and install a sump because someone recommended it. Then you figure out the heater you really need and order it...but when it arrives it won't fit in your sump. Big waste of time and money.
Figure out what you need and why, get the measurements, wattages, flow rates, etc., all worked out. Then start with the sump if you're going to use one, and purchase the equipment you can afford, that will do the job, and will fit within the confines of the system you are building.
Bottom line IMHO is, do not add water, or fish, or anything else to your aquarium until you understand what you are doing and why you are doing it. Otherwise you'll be back on here desperately begging for solutions as to why your fish are dying...and spending a lot more money to try to fix things you overlooked. Then, a few months after that you'll be posting equipment for sale because you're getting out of the hobby.
My advice is, set a side a lot of time over the next several weeks to watch the entire video series I mentioned, as well as some of the other reefer channels on YouTube, and read these forums like you're studying for a job interview.
Your livestock and your wallet will thank you.