Real quick 'n dirty version:
You will need to have a scanline pattern of some sort. You can create your own but if you don't know how, I can quickly teach that as well; I just don't want to make this post bigger than it needs to be.
That's it. Result:
Hi! I'll be sure to try it and let you know of the results!
Could you tell me how to make a pattern?
Can you help with the pattern?
Oh, sorry! How did I miss your reply from earlier?! I'll reply soon with how to make one. I'm out right now.
All Good! Take your time.
To create the same exact pattern as the one I used in my example:
The Patterns panel can be used to manage your patterns.