Do you know the provenance of your wisteria? Is it a named cultivar or do you think it might be an unnamed seedling? Wisteria can take 10 - 15 years to flower from seed and even then you are not certain of getting good quality blooms. If you really want one it's probably best to buy a good cultivar of known provenance.

do you have a pic of your wisteria in bloom and in late summer? Looks like Amethyst Falls can grow here in IL since it grows in your area. :)

What you have is a whip - a very young tree with not yet any lateral branches developed. The suggestion you received is pretty standard for newly planted whips and is worth following as it encourages the development of a strong branch system. And that's were the fruit will grow. What you want to do is make a heading cut where you want the branching to begin and just above one of the buds. You do not need to take it down as far as they said - that is normally the practice for semi-dwarf or larger growing trees. And you don't want this tree to start to set any fruit until it develops a proper habit with some branches and a basic structure. So remove any flowers for at the least the first few years. And you should continue pruning in subsequent years but not in this same manner. This is pretty much a one time shot. You might want to research apple pruning or maybe a local nursery or your extension service has classes you can attend. Apples need routine, preferably annual, pruning to stimulate and encourage the development of fruiting spurs or those little nubby protuberances that the fruit grows on. 6-8' is really short for a dwarf apple. I'm thinking this is a mini dwarf, which only get around 6' tall - dwarfs typically get about 8-10'. Do you have another apple for cross pollination?

I just reread the last part of what you wrote. I'm getting old with ya. You probably don't remember the blooms because the rose was grafted. The grafted variety died leaving the root stock Dr. Huey to grow. Then when you have pruned it your taking off the wood for next years blooms. Don't prune at all this time until it blooms in 2017. Then when it's done blooming prune some it you wish or let it grow for another year.