If you want to race dont listen to this advice about flying an asym off your bow - that would be a slow and losing proposition. An asym is all about sail area, you need an extra 6 or more feet in your sail's foot, or you wont have enough sail area to power your boat. an asym for racing should have something like twice the area of a cruising chute, which flys off the stem. You dont need a small sprit, you need a BIG sprit. Take a look at these:
Carbomax Carbon Bowsprit
Selden Bowsprit Kits
You should talk to a local sailmaker who makes racing sails, for advice on sprit length and target sail area for racing.
If you dont do the asym right , go with a traditional symmetric with a pole, it is a much simpler fit and size question.
You can find spinnaker cranes here:
Masthead Spinnaker Bails