Lots of unknowns here.
Age of the dog (pup or mature)?
Do you have "Basic Training" on the dog (Come, Sit, Stay, Kennel, Leash Manners)? If not....stop NOW!
Does the dog come from a line of proven performers...or is this a
pet quality dog from unknown lineage?
You know that Chessies (as a whole)....can be stubborn and on average a bit harder to train than say a Lab?
Do you have any dog training background?
What are your goals for the dog:
1. Primarily a hunting dog
2. Pet that also retrieves (60% pet...40% retriever on a good day).
You'd be surprised the number of folks (not saying you are in this group), that think you just buy/get a retriever and it should do it's job!
A good retriever will have the INSTINCT to retrieve, but it still has to be trained.
The level of training required is dictated by what your purpose for the dog is....and its personality (they are all different, believe me).