I too am brand new to hop growing and home brewing. In fact, I haven't yet brewed or bought any of the stuff for brewing. I am a lover of unique and flavorful beers, and am planning on brewing in the near future. In anticipation of that, I want to start some hops plants now as I have read that it can take a few years before they provide a bountiful harvest.
I have read a LOT of posts on different websites. Ultimately, I have decided to post here because I live in Fishersville, VA and am hoping to learn from some local growers/brewers. All of that said, let me get to my specific questions:
1) I was planning on planting Cascade but might go with Nugget instead. Which do you find has the most flexibility?
2) I read that when planting the rhizomes, you can plant two in a single hole to ensure one of them takes off. Any of you really do that? I am only planning a small garden (4 plants to start with), and the cost of 4 additional rhizomes wouldn't break me, but I want to know if it is really necessary.
3) I would like to eventually give my plants 20' of growing vertical. I would like to build that structure after the weather gets warmer. How big should I expect my first-year plants to get? I am trying to decide if I should build a big setup right away, or set up something smaller for this first year and take my time this summer building a more durable structure.
4) I see people offering rhizomes to others. I would like to be able to do that after I get my plants going. How do you harvest a rhizome? I just want to have an understanding of that now so I don't do something to prevent harvesting them later.
5) I see that there are gatherings on a monthly basis. I assume those are gatherings to celebrate the consumption of the "nectar of the Gods." Are there also gatherings for brewing? I would really benefit from seeing some others processes before I go out and buy a "middle-age-crisis" amount of equipment.
Although I didn't start this thread, I hereby reserve the right to come back here and post additional questions that I am sure your comments/answers will raise.

Seriously, thanks for reading this and I look forward to learning about and sharing the experience of growing/brewing with you all.
Thanks,
Matt