Choosing a curve is a very personal choice and depends largely on the type of game that you play.
Ultimately there's no simple formula for choosing a blade. The best way to find your curve is to watch professionals and determine which player interacts with the puck the way you do and use that as a starting point to select the right curve.
Flex is determined by the amount of weight (lbs) required to bend the stick 1" over a 1 meter span.
Flex is one of the most improperly fitted parts of a hockey stick and people generally buy sticks that are far too stiff. You'll notice that we have more light flex options than just about anyone on the market for this reason. As an example of flex options take a look at this surprising list of pro hockey flex ratings.
- 150: Chara
- 130: Weber
- 107: Seidenberg
- 102: Kane
- 100: Crosby
- 97: Malkin
- 95: Stamkos
- 85: Ovechkin
- 81: Hossa
- 80: Karlsson
- 80: Caroline Ouellette
- 77: Hayley Wickenheiser
- 70: Kessel
- 67: Marie-Philip Poulin
The above flexes are/were correct at one point in time but hockey players are constantly tinkering so these flexes are subject to change.
The rule of thumb is to have the stick just under your chin when you are on skates but this is also a personal preference. Stick handling magicians may prefer the stick to be shorter to bring the puck closer to their body. Defensive players may prefer a stick that is longer to allow them to cover more ice. If you want to experiment start with longer and take off 1/2" each game until you feel the stick is right in the sweet spot.
A note on length: Our flexes are rated based on the original length of the stick. As a general rule, each 1" that you cut from the stick adds roughly 3-4 points of flex. So if you bought a 66" SR stick with a flex rating of 75 and cut 2" off, the resulting flex would be roughly 82.