Bill
If you haven't ordered the bow yet, check with sponsor Bob Sarrels. He usually keeps some left handed bows in stock. He might just have what you are looking for.
http://www.sarrelsarchery.com/StockBows.htm
On the wood arrows, I agree and would wait on purchasing those up front. The carbons are a lot more durable and forgiving. If you buy your bow from Bob, he can set your son up with arrows too.
When he is ready for the woodies, reach out to Terry Dunn. He makes some of the best shooting woodies around.
Good luck!