At the risk of you telling me to mind my own business I would say if you don't even know the basics of mating why would you be contemplating it. Has the dog and bitch been hip scored, has the dog been Haemophilia tested, are the pedigrees free from lines that have epilepsy? Are they compatible, and what are the strengths and weaknesses of dog and bitch? Do you have the funds to cover the cost of a c section if the bitch should need one, and could you afford to keep all the puppies if suitable homes cannot be found (up to 12 or more)? Could you take back any puppies that the owners can't keep, even years down the line? Could you bear to lose the bitch and/or puppies if things went wrong?
If you still want to go ahead you need to be ready to introdfuce the dog and bitch from about day 8 - 28, although most bitches are receptive for just a couple of days, usually about day 12 - 14 although it could be at either end of the season. You need to keep hold of the bitch because if she is not ready she may go for the dog.
If they do mate and tie, you need to stop her dragging him around and you may have too help him turn. A tie can last up to an hour or more. If they are both maidens he might need help actually mating the bitch.
One mating can be enough, but most breeders do two mating either one or two days apart, but once the bitch has gone off she will not let him anywhere near her.