I use a ceramic tile or an empty cd case as a target. You can even use a post-it note to stick to a vertical surface. If you use a clicker/marker word, hold the target in your hand and present the target to the dog. When he looks at it or sniffs it, click and reward. Eventually, you will be able to set the target on the ground and he will look/sniff/touch it for his reward. You can then start building distance and sending the dog to the target. I first learned target training during agility but I have found it useful to teach my dog to indicate the glove during tracking and teaching her to fetch the newspaper!