Obviously wait until you finish your scuba class. After class, if you know diving is going to be for you we suggest either buying all your gear as a Scuba Gear Package, if you have the available finances, or piecemeal is fine too. If you are going the piecemeal route the first thing you should have in your collection, if you don’t already is a Mask, Fins, Snorkel, and Booties. Next would definitely be a good wetsuit. What we do suggest even before your scuba equipment is a dive computer. Today’s dive computers do amazing things and can really help keep you out of trouble. After the computer we recommend your BC and Regulator. Very last is your scuba tank. We would only suggest buying a scuba tank if you are doing 15 dives or more a year. Do you absolutely need to buy scuba gear after your class, the answer is No. It can all be rented. The advantage however to buying your own gear is that you will have equipment that you have chosen based on proper fit and comfort and after several dives you will know your equipment like the back of your hand. Every time you rent, you never know if it’s going to be a good fit and you may be unfamiliar with the setup.