How do I texture a mesh tilemap

I have a mesh tilemap, and I have a perlin noise generator. I now wish to apply a noise value to every cell on the tilemap. And then assign it a texture representing a land type, let's say sea or land to start, based on it's "height". I'm not sure how to go about doing so. Should I have Cell class that is assigned and contains that sort of information, and how do I go about texturing individual cells of a mesh grid.

I won't ask people to do it for me I was just hoping for some guidance as in what tutorials should I search for or which features I need to explore to do this.