[alexav]

I have to vote "NO" on sending the dog for training, but then I always do!:D
Unless you have some physical handicaps that prevent you from learning to work with your own dog, you will be missing out on ALOT. For the prices they charge (Yep, I checked out the site you posted quite thoroughly) you could take your pup through many group classes and have some left over for private lessons too.
As for the white spot...It is considered a disqualifying fault in the breed standard but other than looking cute, (IMO ;) )it is harmless. Since you bought the dog from a BYB admittedly, you weren't serious about showing him, right? I'm glad you got just what you wanted, a wonderful pet. He sounds wonderful.
Neuter him, train him, and love him.:D