Painting the landscape

Hi everyone.

I’m sorry that this is probably a noobie issue to be stuck on but I have tried to follow tutorials with no avail as of yet!

I have plenty of material instances that I can use however I want to be able to use these to create my landscape and use the paint feature to draw where I want paths and sand dirt and grass etc

Please can someone help me out?

Thanks in advance.

Have you looked at these pages?: