First year you may or may not get any hops but they'll all get pretty tall, that's what they do. Some are suited to be grown on a low trellis but that doesn't mean they are 'short' growers, although there are some that are considered 'dwarf' varieties that I've never grown that don't get as tall as the traditional varieties. They want to grow straight up but you can try to train them horizontally (to a degree) with success. If they can't grow upward to their maximum height on some sort of support, they'll continue to grow upwards until they can't support themselves and fall back downward. At this point, the growing tip will begin to grow upwards again, clinging onto whatever it can get a hold of and this process will repeat itself until the vine has reached it's maximum length. Usually what you end up with is a tangled up mess of vegetation and hops at the height where they were limited.
I'd say to just get them going and see what happens and make adjustments from your experience. I like to allow plants to do what makes them happy so I've never grown them with the intent to restrict their ability to climb on purpose. Lots of others on this forum have done some creative things so let's hope they chime in to help you out.
Good to see you're doing some homework before jumping into the fray. Have a Happy Thanksgiving!