Apply pattern to trimmed surface in Grasshopper

Hi Everyone,

I am a Grasshopper beginner trying to apply patterns to trimmed surfaces. I have watched a lot of Youtube video’s but know one goes through a step by step of how to create a grid from a trimmed surface, generate points and apply to geometry to those points.

Attached a screen shot of what I am attempting. If anyone has a resource or instruction I would be really appreciate.