I started clicker training Lubu the day he came home! I usually do two short sessions a day, but he knows sit, down, up(jump) and roll(roll over). He is almost 12 weeks old! I had some experience clicker training my cat really simply stuff like sit and up(he puts his from paws on my knees). Dogs are way easier!
You can also use the clicker to reinforce good behaviors, like chewing toys or pottying in the right spot. I never seem to have mine handy though, haha.