Just wait for the official announcement about the complete details of affiliate system of Blackjack.fun as the representative itself said that it will be different from the referral format that we all now. Maybe its a commission base or a fixed rate but no one knows and I'm sure he will not answer you here in advance unless it was officially announced.
But I see the affiliate program is already available and fully explained here
https://blackjack.fun/affiliates/#/summary is it not clear?
The offer is a bit tempting but I haven't managed to bring players to this site so no experience still trying.
Regarding VIP , there is an explanation but it is not complete about what we will get as a bonus usually on other sites we will know how much $ we will get.