Woo Hoo Your boys first show.
If he is 8months I would enter him in Puppy(PD) or if he is ring trained well and mature for his age Junior(JD).
Puppy class tends to better if it is his first show, he may be a bit overwhelmed with it all, and judging in puppy class tends to take this in to consideration when placing. Good Luck, relax, enjoy and remember it does not matter what happens, you are taking the Best dog Home.
I am doing Leeds on Toy Day