First of all, don't worry about getting him to stand and do it. They can sit till they're old enough to feel really comfortable about standing.
Harvey Karp wrote in The Happiest Toddler on the Block (a great book!) that a great way to start is, just have them spend some happy time every day on their little potty. Read their favorite books, sing, etc. If they pee or poop, great, and praise them a little, but don't make a big deal out of it at all.
It's great that you're thinking of this so far ahead. It probably means that you will have a real no-pressure approach, and that is the only way to get through it trauma-free all-around. (And it's the only appropriate way for a parent to do it, too.)
As for those toddler years, yeah :) Just want to share, I've really enjoyed the Sears Discipline Book, Easy to Love, Difficult to Discipline by Becky Bailey, and Positive Discipline by I don't remember who. Positive Discipline is really fantastic. There are so many things that they write that totally get me into that little head of hers and make things so much easier. Like, instead of commanding them to do things, or asking them nicely (if you ask as if they have the choice to say "no," they don't understand why we get mad when they use that choice to say "no," when we just gave them the choice!!), just make a game of it, or ask their help (like, if they don't want to get into the carseat: "can you carry my book to the car?" (If he doesn't want to, ok, but at least he's not saying no to getting into the carseat.) Then, when at the car, you're so thankful and praising his kind helpful gesture, that he's more likely to be happy to oblige when you say, ok! Happy boys jump into their carseat so they can go to the park/store/wherever you're going (make it sound fun but don't bribe)!"
Anyway. Great book. I've been reading it for a couple of nights now (couple minutes here...half an hour there...) and it's already making life with my very active, head-strong toddler SO much easier and more fun. (And really - as they point out - do we want our children to be *weak*-willed? LOL.)