Need advice with selling on amazon kdp

[Nathanmaxey2003]

Hello i recently started to sell coloring books for kids on amazon kdp, now how can i get sales starting out without any paid promotion. I know the best way is paid marketing and i will do it but i just dont have any money for it right now, so if anyone can give any type of advice or suggestions i would really appreciate it. Also if u only know how to sell with paid marketing then plz advice what would be the best chepeast way to do it and what would be the best way to do it if money was not a problem. thanks