The most important thing for your equipment is
fit, fit, fit. Your equipment
must fit properly & be comfortable. A mask that constantly leaks or fins that chafe will ruin a dive very quickly. You should be able to find decent gear at a reasonable price, but try on several types of fins, masks, boots & see what you like the best. Remember, equipment isn't always "one size or style fits all". Some dive shops (not all) will even let you try it out in the water & return it if it doesn't suit you. Here is a bit of a guide of what to look for in your equipment.
Masks: should seal well to your face. Hold the mask to your face, lightly inhale & it should stay in place without a strap as long as the light suction is held. If it falls off, you likely have a leak somewhere. If air can get in, so can water. Some people like large volume masks because they feel less confined, but it takes more of a breath to clear. Low volume masks take less air to clear, but can be too close for some people's comfort. Some like multi- paned windows for a better view, some do not like the distortion (like looking through the corner of an aquarium) that they have. The mask should have plenty of room for facial features & the skirt not lay too close to the corners of the eyes.
Snorkels: Some like a basic snorkel that tends to have a little less drag & a little cheaper, some like a dry snorkel that you don't have to clear, as long as it stays in your mouth, but may be a little bulkier. Some like the fold up snorkels that you can tuck away in your BC pocket when not in use & quickly deployed when needed.
Booties: Booties should fit like a sock, but not bind or pinch the toes or any other part of the foot. Some like the zippered long boot for more protection & warmth, some like the sneaker style for ease of putting on.
Fins: Ah.... fins, well some like the full foot fins for ease of putting on & good for warm waters & smooth surfaces. They don't require boots, but aren't very practical for temperate (cooler) waters or having to traverse over rough or rocky ground (I used a pair for my OW dives in a quarry- it was not fun to walk an additional 40 lbs of gear over rocky ground barefoot). Booties & adjustable fins are much more practical in these circumstances. As for the type of fins, you want a fin substantial enough to be able to propel yourself & your equipment through the water. Snorkeling fins are often not strong or sturdy enough to do this very effectively. Split fins tend to be easier on the legs than stiff board fins, but then tend to have a little less power & a bit pricier than the board fins. Board style fins, while they tend to give more power, but does tend to give your legs a bit more of a workout (which may not be all bad
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). Just don't get a fin that is too stiff for the strength of your legs, as this can cause cramping. When trying fins on, make sure they are snug, yet do not bind or pinch in any way. You should be able to flip the fin up & down & wiggle side to side without any shifting of the foot in the fin's foot pocket.
I really don't want to get into the "brand wars". Try several styles of stuff on & see what feels the best for you, if you can. Hope this helps you out some. Good luck in your course.