You can train as an "individual" in areas like the BLM land and National forest without a permit or license. However, under the DOW if you have pen raised birds, other than pigeons which are considered "feral" and do not fall under DOW, you will need the receipt from the place you purchased them to show proof. Also, most places tag their ducks, pheasants, chukar, quail to show that they are pen raised (a tag, clipped toe nail, etc).
Like others said on this thread, double check the DOW rules and regs and you can also call your regional office and ask them.
That's why I always use pigeons and if I get dead ducks from a test or trial, I just get someone from the club to make me a copy of their receipt.
CYA
Greg