Welcome! Nice to see another JRT owner here.
As Ado said, the JRTCC/JRTCA hold many events (both fun and trials) throughout the year that involve racing, go-to-ground, lure coursing, agility, obedience etc etc.
Racing and luring coursing are great fun, and not too technical at all. Try and get out to a fun day with a local club so that you can get the idea of what events go on, and how they are done.
If you are interested in agility, I would definately suggest to have some strong obedeince training behind you. Puppy class and one or two other levels wouldn't hurt.
These are awsome little dogs, very very intelligent, and can learn whatever you'd like them to, so you have a lot of options with JRTs.
If you can, post some pictures of the little guy - I'd love to see them!!