not really i generally just start slow. maybe do some legato stuff first
yes i just stretch. my hands feel wierd if i dont.
Yes, I've got a special finger training device :)
pull my fingres backwards till i can feel presure then mimic opening a doorknob.
Occasionally. I pop my knuckles a lot if that counts. I sometimes wave my hands like some people do when they cramp. Just small things that really don't affect anything.