Permissible and impermissible items of trade

Q: I have a business where I sell shoes. Yesterday, I found out that the inner lining of some of the shoes which I am selling is made from pigskin. Is it permissible for me to sell these shoes?

Q: Is it permissible to sell ebooks?

Q: Trading in cosmetics is ok in Islam or not? Please explain in the light of Ahadees?

Q: We are a group of Muslims thinking of starting an online web shop for Muslim married couples. We would like to sell adult related items (sex toys). Is this permissible?

Q: Is it permissible to sell artificial hair?

Q: I have one question - is it permissible to buy cleaned Sea Shells from an Arts and Craft Shop and use it for internal house decoration, eg in the bathroom. 

Q:

1. If women have gold, silver, and diamond crucifixes, aum, and Buddha jewellery before excepting Islam, what should they do with them? Should they have them melted and redesigned or should they bury them?
2. What is the punishment for Muslims selling jewellery for kuffaar religions?
3. Can Muslims wear jewellery that has the name of Allah and ayaat from the Quran in lockets when we don't have wudhu?