Start by teaching your dog by issuing command when training him.
Commands are special words that you repeat over and over to condition him to obey.
Although there are certain command words that most trainers teach, in theory you could use any word you want to designate a command. 
The most important thing is consistency. You must always use the same word for the same command. Mixing command words up will only confuse your dog and make training him more difficult if not outright impossible. Th...