Before you get into the nitty gritty of choosing training routes and flight schools (and therefore commiting yourself to a lot of expenditure) I would first substantiate a couple of things.
What has he done so far in the way of following his dream? Is he an air cadet? Has he studied aviation in any meaningful way? Has he any work expereince in the field? Any trial lessons, or visits to flying schools?
Has he had any aptitude tests? If not GAPAN (just google GAPAN) might be able to help you out with an aptitude test and they do scholarships as well, so a good contact to make in any event.
Whether or not any of that applies, I would kick off with a five hour starter pack, which any good school should offer at a reasonable price. This is long enough to get an idea of what training will involve, but won't cost you an arm and a leg if things don't work out.
Don't be afraid to set the agenda when you are negotiationg your requirements with a flying school - it's a buyers market.