I couldn't open your link, so unfortunately I can't tell you much about that, but I'll take some time to help you out.
I finally got to get my certification when I was 15 too, so I can relate your enthusiasm! It sure doesn't feel like 20 years ago.
I'll bet that you could stretch that $75 budget by shopping here, because Joe and Larry will give you a ten percent discount for being a member of the forum, and after 10 posts I believe they'll give you a $10 gift card. If my math is right, that will give your seventy-something dollars just over $90 of spending power!
If I was starting out with that budget knowing what I know now, this is the mask, fins, and snorkel I would probably get. I haven't used any of this gear, but I'm confidant that it will do the job for you, and that it's quality stuff that ScubaToys will stand behind.
Let's start with the snorkel. It's required for the class, but actually using it instead of a regulator is only an option at the surface, and you're learning to dive. As a beginner you'll want to learn how to use a basic snorkel, and since you'll want to avoid choppy conditions until you get some experience and develop solid skills, you don't really need a fancy dry snorkel unless you really like them and expect to do a lot of snorkeling. I recommend just getting the most basic one you can find, and on ScubaToys.com, that seems the $4.95 Mares Space Snorkel. It sounds pretty futuristic, huh?
It's features include being a snorkel, and having a replaceable mouthpiece in case you get hungry and eat the one that comes with it. Another feature it has is the uncanny ability to leave you with around $85 or $90 to spend on gear that matters... your mask and fins.
Masks let you see, which is important to most people's safe enjoyment of diving. The most important one is getting a mask that fits well, and I'm honestly not sure how fitting works over the internet. I'm sure Joe or Larry would be happy to help you out with that though... they do it all the time. I don't work here, I just have insomnia and a helpful inclination.
I'd recommend the Mares X-Vision for several reasons. First, it's a nice mask on sale for 44.95, so you can afford it. Second, it's available in two sizes, so it's likely to fit. Third, it has a pretty low internal volume, which means it's relatively easy to clear water out of it when it floods. Fourth, it gives you a wide angle of view, and that means you can see more and be more aware of your surroundings.
So... you'll have about $40-$45 left for fins. I better start a new post.