Especially if your mask is a Snorkel mask with a nose purge. Once you put your regulator in your mouth, ive found you have a lot harder of a time clearing your ears with a nose purge mask. A nose purge is sgreat for snorkeling, but once you get into diving, the plastic purge is a hinderence especially if you are not comfortable with a mask full of water. I use Atomic Split Fins, they are a bit on the priceier side, but i tried a blade fin in the pool and a split, and i found a split was easier for me and used less energy and provided equal if not more power. Before those i hade a set of blade fine used for snorkeling, but could laso be used for diving, the were US Diver fins, i love those fins, i still use them to this day, as a back up, if someone orgets theirs or when i dont want to where booties since they have a neo-prene heel guard on the strap.
As for masks what ever fits the best is the best. It doesnt matter if its one of hte integrated skirt masks from Atomic, or one of the cheaper ones.
Dont skimp on your basic gear. Were not telling you to go buy your BC Reg and computer, but dont skimp on the basics.
As for snorkels, dont spend the 40 or 50 bucks on the dry snorkel unless you are going to be doing ALOT more snorkeling then diving, becuase hte only time you need a snorkel in diving is when your waiting on people to get in the water or on your shore swims.
Welcome to the sport of Scuba Diving.