Replying to Painting Skis (isearched)

So I decided I'm going to spraypaint my scratch Fs' (the grey ones with the caution tape)
and I looked at some threads and this is what I got:

- Sand them alot
- Spray Paint
- Clear Coat

seems pretty simple but I still have some questions.
Do i use fine sand paper or course sand paper and how much do I sand?
Which Spray Paint works the best and is durable/  its okay to layer different colors right?
Which clear coat works the best and does more layers of clear coat make the paint more durable?

thanks a lot, any tips would be helpful as I don't want to ruin my skis.