This thread is good. I don't like it when cash croppers have to hide the fact amongst the community. Nothing wrong with growing for a living IMO. We all need to make a buck and if growing weed is your skill, then deal away! Just don't get caught. ;)
I wouldn't go above 6 ft. Anything above that is likely to attract attention in its own right, which is something you obviously don't want. Build a fence to a height that you're comfortable with and train or prune your plants accordingly.
You would think so!
If the OP is talked about an unrooted clone (a cutting), then straight into soil is not a good idea. No many bacteria to potentially cause rot to the open wound (where it is cut) before it heals and roots.