Some important things to remember:
1. Buy a mask that has the words "tempered glass" on it. If it is not tempered glass, it WILL shatter.
2. Buy a mask with the smallest area of glass you can.
3. The way to tell if a mask fits is to hold all hair off your face with one hand and then hold the mask to the face with the other. Breathe in through the nose. If the mask stays put, it is a good fit. If it falls off the face it is a bad fit and will leak.
4. When buying a snorkel buy a simple, cheap J tube. DO NOT buy one with anything covering the top of the snorkel and don't waste your money on fancy snorkels with drain valves.