How to create page on plugin intallation???

Take a look at the register activation hook function.

https://codex.www.ads-software.com/Function_Reference/register_activation_hook

Thanks you Nate, i just had a problem every time the plugin was modified trough the wp editor, restart the plugin and created one more time all pages, so i asked wp if one of the pages already exist by his slug.. everything seems to be working fine.. thank you!