As Agile Basenji stated, find a local conformation class, you can get private lessons but I think that a group class is better for the dog as there's more distractions going on and the ones I've been to have had all the people go over other's dogs so they're used to strangers approaching and touching them.
Get a grooming table if you don't have one already, stack your pup everyday, have friends come up to him and look at his teeth and run their hands over him. Don't forget the testicles….the judge is going to feel them too.
I've only showed one dog so far, and it took me just shy of two years to finish him....but...I did all by myself and there's nothing like it when you get those last points. I had to travel to Az for majors but that was part of the fun. Some people like showing, some like other sports.... you pick the one you want and go for it. All dogs have faults, some more than others, but when you walk into that ring, it's all about the judge and what THEIR opinion is.
You will find it harder with a Trindle as some judges will put you last just because of it, but there are trindles that are Champions...they are Brindle pointed tri's...note the Tri...they fall under that color category.
Go to the shows beforehand and meet some breeders and find one willing to help you. It may turn out that your boy doesn't do well in the show ring, but I give you points for even trying!!!
DO however, get that fanconi test done as Sinjabe suggested. You can still show him, but you will want to get him neutered at some point before he gets too old and you want to know what is in store for you should he test probably affected.