Here are a few tips that we picked up along the way:
-for first year hops, you don't need a huge trellis. A 10 or so foot high trellis is technically enough
-get your irrigation figured out before you plant. Hops use a lot of water and your irrigation setup may affect how you arrange your rows or plants
-Don't rush the planting. We learned the hard way that you should just wait until the threat of frost has past. Rhizomes should handle a late frost a little better, but freshly transplanted live plants don't like to freeze.
-We sourced our live plants from Great Lakes Hops and had good luck with them. There are only a few other live plant vendors, but rhizomes are available from quite a few places.
-Put a lot of thought into the varieties you want. If you are a homebrewer, make sure to plant what you actually want to use. If you are growing to sell, make sure that somebody wants to buy that variety. Some varieties are in demand, others are not. Three pretty safe bets are Cascade, Chinook, and Centennial.
There are a lot of things to think about when planting new hops. Michigan State University has a lot of good information about small scale hops production. Make sure to do your research before starting; otherwise you could make some costly mistakes that are hard to recover from.