What would be the best cake to use for a boys birthday using fondant???

All depends on how old is the boy? Does he have any interest in a certain sport? Does he like music? Does he have a hobby? That could be a good start for inspiration! Good luck!

I pretty much have an idea what to do for him, he loves racing cars, but no clue what kind of cake, flavor, type, etc., and I heard not all cakes are suitable for fondant?????