I used target training to get my three interested in the clicker as its such a simple command.
So once you have your dog tuned into the clicker you are ready to start.
You can use anything as a target - i started with a bit of bamboo with a white mark painted on the tip and a clicker attached to the bottom, its less fiddly that way ;)
Rub a bit of something very tasty on the white mark, dogs are curious beasts and stick their noses into everything so as soon as your dogs nose touches the white mark C/T - if you are slow and he licks the mark thats what you will have reinforced. Ive found with my three that they can sometimes "forget" a command about 6 times after repeating it so if your dog sits back and looks at you with a "What the hell do you want" expression dont panic, put the stuff away and try again later.
Once you have your dog touching the target everytime you can add a command word, as your dog touches the target say the word (touch is always good lol) and then C/T repeat, repeat, repeat.
Dont forget to make sessions fun and SHORT, if you or the dog arent in the mood try again a different day.
If anyone else has a better way or tips feel free to add here