New cockpit LCDs usage

So..How do I use the new LCDs that are in the vanilla (and I assume also in modded) cockpits?
I understand I need to use IMyTextSurface? How exactly I tie it to a block? What would be the difference between it and using IMyTextPanel when refering to regular LCD which is not in a cockpit?

How to know how many LCDs there are, if at all and their order based on the index number?