Hop rhizomes are planted in the spring as soon as you can work the ground. I bought some in the spring as well as joined a group called Grow_Hops on yahoo, and got 3 free (paid shipping) through that group.
For this year just prepare where you plan to plant them. Test he soil and see what you need to add, put a lot of manure on top and compost if you have it. Make sure it is acidic enough for hops (though they are basically weeds and will grow in most anything).
"People should not be afraid of their governments. Governments should be afraid of their people." - V
Secondary: Shady Lord RIS, Water to Barleywine, Pumpkin wine, burnt mead
Kegged: Crappy infected mild
Bottles: Apfelwein, 999 Barleywine, Oatmeal Stout, Robust Porter, Robust smoked porter, Simcoe Smash