Your stick blade should rest comfortably on the ice when in a skating stance because you want as much of your blade's surface area touching the puck. A taller person should go for a higher lie, and lower for a shorter person. A typical lie is between 5 and 6.
The flex of a stick is the elasticity of the shaft. Think of it as the spring in your stick's step. A general rule is more flex for more weight or longer wingspan (think Chara at 130 and Kessel at 70).
A kick point is where all the stick's power comes from, because your stick will bend and snap (Legally Blonde reference...) at that point. Having a 'Mid' kick point will be better suited to strong shooters while a low kick point is best for playmakers.
Many sticks can come coated with a sticky resin so your hands don't slip off easily. Newsflash! This is called a grip. Some people like having this sticky grip coating their stick shaft to maintain a firm grip while others prefer more freedom with their hand positions.
Angle means how much of the blade can you see when the stick rests comfortably on the ice while in a skating position? If a blade is open, the base of the blade is seen easily, which is great for lifting the puck. If it's neutral, the top and bottom of the blade sit over one another. If it's closed, the top of the blade hides the base and it's harder to lift pucks but easier to puck-handle.
When choosing the correct angle of your blade, it's important to know where the angle starts curving. This is called the Sweet Spot. Blades start curving either at the heel (meaning where the shaft meets the blade) or the toe (meaning the end of blade). Heel curves typically lift the puck easier and are favored by shooters while toe curves can keep pucks lower and are preferred by stick-handlers.