This is a book I read 40 years ago. I remember the plot but haven't a clue as to the title.
A young man misses the takeoff of his trader families’s spaceship and is marooned on a planet. He has no real skills to find work and falls in with a gambler who shows him how to play a game that will provide him with enough credits to live on. After a botched robbery attempt where his benefactor is killed, he finds himself a very rich man and sets out to pursue a rumor of a FTL/Warp drive so he can be reunited with his family.