S8 and American Beauty make a great combo. Both are reasonably common these days, good producers and grow well in most climates, without being too fussy. You can plant one cutting of each in a 25gallon bucket without worrying too much about them having room to grow solid root systems, but I do recommend using a watering spike in the pot, what they use for drip irrigation, so you can get the water to go deeper into the soil, and encourage the roots to follow. DF plants tend to root shallow, as thats where the water is, but if you water deeper, they will root deeper, and that builds a stronger root network in finite growing areas, like containers.
As far as a trellis, some sort of support structure is strongly advised, as these are natively climbing vine type plants, but you have to be aware that whatever you grow them in, or against, is going to become a permanent fixture in your garden eventually, as these plants get very large, weighty, and topheavy very quickly once they reach a mature state. People over the years have come up with clever mobile growing solutions for locations where the plants need to be either moved around or taken in for winter months, but its not a simple thing to do. If youre looking for trellis or support ideas, scroll back over the pages here and there are plenty of pictures and discussions about the traditional and more creative ways people grow their plants.
And as always, questions are encouraged here, and there are plenty of knowledgeable and experienced people here that always seem to be more than happy to help.