Permissible and impermissible items of trade

Selling soccer t-shirts

Q:

1. I want to sell t-shirts with different country flags on them for the upcoming Soccer World Cup. Will it be permissible to sell these t-shirts?

2. What is the ruling on advertising products with videos of people using them? Sometimes, products need a video demonstration or a photo to show how to properly use them. What is a permissible way to do this?

Selling a book that one got for free

Q: Am I allowed to sell a book I got for free?

I ordered a secondhand book online for a class I'm taking. It arrived very quick, and it looked completely new, not secondhand at all, but I no longer needed it as I had already bought the ebook. I put the book for sale online. What I usually do is sell it for 2x or 3x the price I paid, but still cheaper than the retail price. But then, a few days later, I got another copy of the book in the mail, and this one looked more like a secondhand book with highlights and stuff. I thought maybe the company made a mistake and sent me 2 copies, but I just remembered, about a month ago, I had filled out a form on the book company website pretending to be a teacher to see if I could get the book for free. I have done these before, and they never work, so I was just doing it for fun. My answers were absurd, with a fake name, institution, etc, and I thought it would eventually take me to a page with more security where I would have to provide proof of identification, but the form suddenly ended and it was submitted. I had completely forgotten about it, and there were no updates in my email about the book, whether my request was approved or whether the book was shipped. I still have a feeling that this company is likely the one who sent me the book. So, my question is, what do I do with the book? I didn't mean to get it like that, like I didn't think the form would work, but now that I have it, is it permissible to sell it?

Selling artificial rings

Q: I read in Behashti Zewar that it is not permissible for women to wear artificial rings.

1. Since I was unaware of this ruling, I already have many such rings that I used to wear. What should be done with those rings?

2. I have given rings as gifts to many women in the past and my jewellery business gave me profit from selling artificial rings. Will I be sinful for this? What should I do now?

Writing a fiction book

Q:

1. If a person wrote a book which is a mix of fiction and non fiction and they sell the book, is the money earned from that halaal?

2. If that same book has slight romance in it, will the money earned from it be halaal?

3. If that same book has swearing (which the readers will be warned of) then is the money earned from it halaal?