How do I start?

I have these (photos) Is it possible to use the extensions on a fake finger?And what are the colour powders for if I have the bigger pots of acrylic powder is it the same thing? Or how else do I use them?

I have these (photos) Is it possible to use the extensions on a fake finger?And what are the colour powders for if I have the bigger pots of acrylic powder is it the same thing? Or how else do I use them?