The hops are dry enough once the central stem (strig) breaks more than bends. Oxygen is the enemy of hops, so it is important they are properly stored. For small amounts of hops, oxygen proof bags with the air squeezed out (or purged with nitrogen/CO2) work well. I prefer to pack my hops in vacuum sealed bags not only to get out oxygen, but to cut down on the storage size. Generally homegrown hops are recommended more for flavor/aroma additions due to the uncertainty in the actual alpha acid content. Growing hops is extremely rewarding. There's nothing quite like brewing a beer with the fruits of your labor. Good luck and happy growing/brewing.