New collector with many questions

Hello,

I am from Germany, 26 Years and I'm planning 3 weeks to collect the Hasbro figures started because I had found my grandparents still 2 characters from my childhood clean up.

The moment I have 20 pieces and I want to grow little by little the whole collection. Of course I respect this is complete with accessories.

I have some questions about it.

1. How rare are the Mailaway figures? Are there any numbers?
2. Kamala Moon are all the characters in firm hands, or there is a sale? What is the price?
3. Some characters have small color errors. What color do I get this revision so it looks original.

Best regards and sorry for my English