Dude, you're totally going all in right at the start.
As others have mentioned, there are other small things you should have along with the big stuff.
So, I'll mention some general things. First, make sure you've read up on what you're doing. John Palmer's How To Brew has a free read online - though that is the first edition, and he's updated things since then. I think he's on edition 5 now? Also, Charlie Papazian's Complete Joy of Homebrewing is another great book to have. I do recommend homebrewers have both of them on hand.
I would also recommend starting simple - don't brew an all-grain lager the first time out - go with a pale ale, extract or extract with steeping grains. Don't make things more complicated than they have to be until you have the basics down. The other way leads to frustration and quitting.
Also, the things that make for good beer are sanitation, yeast health / quantity, sanitation, temperature control (in brewing and fermenting) sanitation, patience and sanitation.
Keeping things clean is imperitive - you don't want unwanted bugs getting your beer (unless you are brewing a sour, which is a whole 'nother can of worms. (Making sure your yeast are happy - that you are pitching an appropriate amount, your wort is a good temp, it's good temp through fermentation etc. And patience. Kits and recipes say to give it X days to work. Yeast don't have calendars; they finish when they finish. Don't watch it like a hawk, opening the lid every day to take samples. There's no reason for that. I'll watch mine to make sure things appear to be starting in an appropriate time, then I walk away. Forget about it for a couple weeks (unless there's areason to come back early, like dry-hopping.) With time and experience, you'll learn what works best for you.
Take notes. Write down (paper or online) your recipe, timings, expected and actual boil rates, graviites, amounts and so on. They will be of use when you want to recreate a recipe or troubleshoot.
Above all: RELAX. It's just beer. You'll have some batches that don't work out, for any of a number of reasons. It's OK. There's sometimes things to correct the batch, or worst case is a drain pour. Learn from your experiences and move on.