All the above and work closely with the unit after being on your own if you can. The more you help out, if your help is needed, the better. Sometimes it takes doing the crap work to be able to become the handler in the future.
First and foremost, learn the job and be good at it. I would also suggest looking at departments that have a favorable attitude to dogs. Saint Paul PD and Minneapolis PD have about 20 dogs in each departments. Some other PDs don't believe in utilizing dogs and probably never will in the future. A lot has to do with the chief and his beliefs, and mostly....$$$$$
K9
"The difference between the mile and the marathon is the difference between burning your fingers with a match and being slowly roasted over hot coals."
-Hal Higdon-
"You have to forget your last marathon before you try another. Your mind can't know what's coming." -Frank Shorter-