Are corn, beans, and rice a no-no on pover? How about powdered Coffee Mate?

I don't know about the coffee mate...but I would think...anything organic would be kosher...I was raised gentile...but corn is a natural product ...rice (in it's full grain state) is natural...beans....well, non-processed..is natural...maybe a bit of work to cook in that state...but still natural...i may be naive in the requirements of kosher...but my basic understanding is the if God supplied it ...it's ok to partake ..have a wonderful Pover