Hi,
1. HikaMarket is an add-on for HikaShop.
You can read more about the requirements in the product page, tab "usage".
www.hikashop.com/extensions/hikamarket-multi-vendor.html#usage
2. Yes, the "vendors" are notified of orders which contains at least one of their product.
The "order" they see will only contains their product, so they will be able to manage only their part.
The order notification for vendors is activated by default and can be customized/configured, in order to add more recipients or to filter on the order status (like : just send the email when the order is confirmed/paid).
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.