Talk to your instructor before trying this technique as they may have a method that they feel is better suited to your particular needs.
It is important before you start that your dog likes toys but is not possessive of them. If your dog is possessive (or you are not sure if your dog is possesive) talk to an instructor about teaching your dog to give you toys. Start off in a place where there is not going to be anything distracting to your puppy, a hallway or a room. Have a toy the puppy likes/wants. You might need to build a desirer for the article by playing with it yourself before letting the puppy get it. There is a very good article at http://www.clickerdogs.com/createamotivatingtoy.htm
Sit on the floor or on a chair. Throw the article a short distance. Try to avoid too much encouraging of the dog to get or bring the toy, it is far better that you are quiet and let the dog work out that the toy is much more fun when they bring it to you than if they sit with it by themselves. The idea is for the dog to learn that toys are really only fun when they are bought back.
When the dog brings you the toy don’t try and take it. Better to play with the dog, touch the toy but don’t try and pull it from the dog. You want the dog to feel confident that you are not going to try to take the toy off the dog if they come back to you. When you get it again throw it for the dog and give it another chance to play with you. You can introduce the word "give" at which point you stop playing and gently take the toy back and throw it again. The idea is that the word "give" becomes an indicator to the dog the game can be restarted by letting go of the toy. You might try exchanging the toy for food. If the dog drops the item simply stop patting and playing with the dog and throw the toy again, patting and playing happens so long as the toy is in the dog's mouth. If at anytime you can not not easily get the toy back when you want to talk to an instructor.
It is important you stop playing before the dog decides they have had enough.
This is not really about teaching the dog to tug but rather that being with you and the toy is more fun than being by themselves. If you are going to be playing tug with the dog (and you don't need too with this technique) you need to have very clear rules in place and to always be in control of the game. You need to be able to stop the game at anytime you want and have the dog drop calmly. There are very good articles on rules relating to playing tug at http://www.sfspca.org/behavior/dog_library/tug.pdf and http://www.diamondsintheruff.com/tugowar.html. Make certain you ask an instructor about playing tug with your dog as some owner/dog combinations are not well suited to playing tug.
When your dog is regularly going out and bringing the toy straight back to you you can move to a more distracting environment.