Permissible and impermissible items of trade

Q: Please guide me about selling and purchasing of drone cameras. These could be used for photo taking and video recording.

Q: I want to sell physical health eBooks that may contain images of humans for the purposes of demonstration. E.g. a fitness eBook demontrating how to perform an exercise or movement. The intention is that buyers will be purchasing the eBook for the information and content and not for the images. What is the ruling on this (both male and female images, would awrah need to be covered as this is solely for demonstrational/educational purposes?) and will income gained from this be halal? If this is not permissible, could you give me guidance on other methods I can use to demonstrate things such as exercises/stretches with visuals etc.

Q: Nowadays there are emojis (smiley) cushions available in the market but their eyes are hidden. Is it permissible to purchase them?

Q: Wholesalers often sell to retailers large stocks on a credit period and for this credit period they often charge a little higher price for the stock then those making cash sales. It is clear that retailers purchase big stocks and cannot pay for that upfront and often prefer to purchase on credit. Does that little higher price charged for the credit period amount to interest? A house hold appliances wholesale business is in question.

Q: My family wants a kitten/cat. I live in the USA, and where I live it's very hard to find someone who's giving away a cat. I heard that it's not permissible to buy a cat. Can you please tell me the ruling on this? Can I buy a cat?

Q: My brother sells Viagra tablets (these tablets are used for erectile dysfunction). Is his business halaal or haraam? We do not know whether the customers who buy these tablets will use them in a haraam or halaal manner.

Q: Is it permissible to order Islamic books online and have them delivered through shipping, even though the books contain aayaat (and some are tafseers and translations) and one knows that the shipping process is quite rough? Realistically, the packages will be thrown around, placed on the ground, will have other goods placed upon it, might even get stepped on, etc. before it gets to the destination. Am I allowed to order?

Q: Is it permissible to sell seven coloured chakra (yoga) bands, bracelets, necklaces, yoga mats, yoga pants and other items related to yoga?

Q: I want to create a learming app in urdu. It will have takhtees with the voice of my nephew and exercises for learning urdu and no pictures of living things. Is it permissible to create and sell such an app?

Q: I like to buy a persian cat and use it as a pet. In future if it may give birth to babies, can I sell the cat for money?