I assume since you mentioned WKA, you're talking about sprint racing. If that's the case and you clearly don't want to own your own equipment, I also assume you want to get your kid into a car ASAP.
I'd contact a couple of SKUSA teams (google it) and see what's available and pricing. Then contact some more local shops and see what, if anything they might offer. If your driver has no or little racing experience, you should also hire a driving coach for each event. As Freezeman suggests, depending on the level of competition you're after, it WILL be costly! A year or two of karting, ASSUMING he shows a LOT of promise, it's time for a car. Again, assuming you don't want to own your own equipment, Skip Barber Racing or something similar might be your next step. We did it for one season ( that was a financial wake up call) with Skip Barber in their Eastern Series. We budgeted $3000 per event for an 8 event series. Ya, pricey! That was in 1997, so figure $5000+ per event now.
IF he's good and you want to go the next level....likely $100,000 per season will get you a ride in something.
Regular folks, unless you have a rich uncle, will run out of money real quick!
We did.
Skip Barber was Great, and IF we had the money, we'd still be doing it.....but we don't have that level of play money! So we road race karts. Karts are great fun, best bang for the buck, you DO really learn how to race, you won't break the bank if you use your head, and you make life long friends. Wouldn't give it up for anything!!
Have fun,
Clark Gaynor Sr.