The advice would be the same for any kind of fiction. Keep writing, and keep sending things out, not to friends and relatives, but to people who have the power to buy. A lot of additional, useful tips could be added, but this is fundamental. ↗
It was really impossible to break through in Russia. We couldn't buy any balls. We really didn't have any courts, no rackets, nothing. And no people to practice with. ↗
Being a salesman and an actor were not that dissimilar: It is a good lesson in covering up your feelings. No one wants to buy from someone who looks depressed. ↗