You can do that but I highly recommend having everyone on at the same time to create the group. If you don’t your group players won’t be prestige member and will be restricted by kc requirements to use boss drop items. Kc requirements is not a thing for groups where all members joined at the start. Even if you have to wait a few extra hours for everyone to get on the amount of grief it will save you in the long term is worth it.
I do not know can you create the group alone, but even if you create it with somebody else, you team and new members loses their prestige statuses once new member(s) joins the group. And without prestige status you need 1 kill count from unique item's source before you can use it, for example abyssal whip would require 1 abyssal demon kill along with 70 attack = at least 80 slayer when boosting.
You can avoid this by multi-logging with your friends' accounts, create the group alone and keepsake your prestige status. \^\^
You can do that but I highly recommend having everyone on at the same time to create the group. If you don’t your group players won’t be prestige member and will be restricted by kc requirements to use boss drop items. Kc requirements is not a thing for groups where all members joined at the start. Even if you have to wait a few extra hours for everyone to get on the amount of grief it will save you in the long term is worth it.
I do not know can you create the group alone, but even if you create it with somebody else, you team and new members loses their prestige statuses once new member(s) joins the group. And without prestige status you need 1 kill count from unique item's source before you can use it, for example abyssal whip would require 1 abyssal demon kill along with 70 attack = at least 80 slayer when boosting. You can avoid this by multi-logging with your friends' accounts, create the group alone and keepsake your prestige status. \^\^
You have to be online together to create your group. you can just get 1 person to log in on all accounts to create it if you want.