orienting objects on normal of surface

I'm new to grasshopper and I got my script from another site so I'm just playing with it to get what I want.

I'm trying to array an object on a surface with a grid. the scale of the objects change according to distance from a curve. 

but i don't know how to orient the object to the normal of the point on the surface. so now all the objects are facing upward.

also, the scaling is pretty difficult to handle right now, its just dependent on a multiplication component so the objects turn out to be either too big or too small, is there a way to better control the scale?

THANK YOU!!