Selling products that are not in one's possession

Q: I would like to know if I can deal in the following ways:

1. Sell a product on an online platform and receive payment (part or full) but the product is not in my possession.

2. Sell a product on an online platform and receive payment (part or full) but the product is in the stock of my supplier who promises to send me when I have confirmed the order.

3. Being the official rep of a particularly expensive but slowly moving product, can I take orders with part or full payment and then place the order with my supplier?

Zakaat on fruit trees, bee hives, solar panels and cattle purchased as an investment

Q: I would like to enquire about a few zakaat issues:

1. How much zakaat needs to be paid on fruit trees, which have been purchased as an investment?

2. How much zakaat needs to be paid on a bee hive, which has been bought as an investment?

3. Is a solar panel, which has been bought as a form of a money making investment, a zakaatable item - and if so: how do I calculate Zakaat on it?

4. How much zakaat needs to be paid on a business venture which entails investing in a cattle feedlot? The money invested goes into purchasing cattle and providing feed for the cattle for 4 months and then selling them off. Investors do not own specific cattle but buy a share of the total cattle.