With the exception of the snorkel, all of those items are ones you will want to try on. If you are planning to dive this gear head down to your local dive shop for advice. Hit more than one store and ask them if they can give you any kind of package deal. Dive shops don't all carry the same brands either. One will be a ScubaPro dealer and the next will carry Aqualung. Check 'em all out.
Here's what you need:
Snorkel...any will work, but a lot of folks like dry snorkels so they don't worry so much about sucking water by accident. Personally, I hate snorkels. I usually carry something I can fold up in my pocket if I carry one at all. Definitely a personal preference.
Wet Suit...you're going to get what you pay for here and can easily spend several hundred dollars. Cheap wetsuits are available for less than $100 though. Lots of choices too. 3mm, 5mm, 7mm thickness...thicker is warmer...and also harder to don and doff. Shorty, Farmer John, and full styles. You can get them lined, or not...stretchy, or not...wrist and neck seals, or not...you get the picture.
Personally, I wouldn't let anyone talk you into one of these so early on. Rent different wet suits. Try 'em out until you find one you like. Go to more than one store and try out different brands. I like Pinnacles, but they're pricey.
Booties - You need a pair of these for walking around before and after the dive and to wear with open-heeled fins. No need to spend a ton of money, but I'd suggest something that covers your ankle, otherwise you might end up with blisters, etc from your fins.
Mask - Once again you usually get what you pay for. Masks are all about getting one with the proper fit. I prefer double-lens, black skirt masks, but the best mask I ever owned had a single-lens, clear skirt. The most expensive mask I ever owned was also the least dependable. Go figure.
Look for soft, double-skirted, medical grade silicone. When you put the mask on your face (without the strap in place) and suck in through your nose it should seal tightly to your face and not fall off. If it doesn't seal, it doesn't fit...look for something else. Try on lots of different masks at different stores.
Fins - there are lots of different styles and colors of fins. All the manufactures have some kind of unique feature that they tout as being the next best thing since sliced bread...split fins, power bands...blah, blah, blah. I've had $200+ fins and fins that have cost less than $100. Personally, I like fins that are plain and simple like the ScubaPro jet fins. OMS makes a similar model that is lighter in weight. Split fins are comfy, but if you really need to get up and go you won't be able to...I don't care what anyone tells you. This is definitely a Keep It Simple Category IMHO. You'll pay less if you skip all those fancy features and you'll get a more durable, dependable fin. Open-heeled is the only "must do" in this category. Other than that just find one you like. I'd recommend trying on lots of different fins. Ask the shop if they'll let you try several of them out in their pool. They should...if they don't the go somewhere else. Of all the basic gear you're buying the mask and fins are the most critical. Make sure you get something that works for you...it'll save you money and aggravation in the long run.
Good luck!!!
