Freeze asap if doing fresh frozen... though Ramsay wouldn't approve of fresh frozen!
If the buds are larfy then don't worry as much about trimming. The buds will hold onto the heads if they are dense buds; sometimes water won't even get into the buds after a 12 minute wash. Break 'em open and the heads are still on the bud with no moisture in the bud.
Clean ice, homemade if possible.
3%-8% return. Sometimes more depending on the strain, the quality, and handling of material.
If you have a lot of material then use all the bags first run and leave out bags for the next runs as necessary.
Have fun!
Thoughts are powerful. Don't believe me? Think of a lemon...