You have much to learn indeed

... and we all had to start somewhere.
First off, forget Eastwood -- all they do is sell you other manufacturer's stuff at a 30-40% price hike. With a little research you can do a lot better than that and have a lot more colors to choose from.
Powder coating powders are made from a variety of ingredients including acrylic, polyester, polyurethane, epoxy, etc. (and hybrids which contain more than one), and each has its own inherent uses and applications.
Generally speaking, a half pound of powder is equivalent in price and coverage to three rattle cans of spray paint so a little bit goes a long way.
I've been at this since 1999 (practicing on my own parts on my old hot rod) and have been at it full time now since 2007. Despite almost 15 years in the industry and undertaking work that no one else on the planet will try to do ...
I just finished these up yesterday ...
... I will NEVER ever call myself an expert ... because that's the day I'll quit learning anything new.
The choices and results are virtually limitless with the different kinds of powders available -- glossy, matte, wrinkle, veins, rivers, candy translucents and special effects -- and the only way to get comfortable with it is to pretty much jump in with both feet, give it a try, and don't be afraid of what's going to happen. Sadly, you won't learn much sitting on your **** reading about someone else's experiences straight up simply because solely in my opinion most of the people who devote time to posting on powder coating forums aren't out there actually coating anything when it comes down to it. They're just passing on someone else's (usually wrong) information.
I also can't recommend that you invest a bunch of money into top-of-the-line equipment, at least not at this early juncture, but you can always move up if it turns out you really enjoy it like I did.
I wish you every success!!

Keep us posted on your progress and don't be afraid to ask questions.