How do I curl my hair using a curling wand? Happy new year guys!

 So I got a curling wand for Christmas. A few days ago I started trying to use it but I'm not exactly 100% sure of what to do.

I've tried watching videos but the ones I found didn't explain things well. I tried putting on hair spray, straightening it first, brushing my hair, wrapping my hair along/around the hot bit for 10 secs  and then letting it go, that's what my gran told me.

When I try to do it there's either something that looks like a fold mark in my hair or I make the curl too "extreme" and it goes really curly, I'm just trying to get some loose curls

My hair isn't naturally straight so could that be why? Any techniques? How much of my hair should I curl?