What if  I wanted my Oxide Default group to always get the Default spawn set I created. How can I give a VIP player a different spawnset every time but it wil not by accesible to any default players?

Autokits

Autokits are kits that are given to a player when they respawn after dying.

What kits are included are to be specified in the config file under "Autokits ordered by priority" by using the kits name

The plugin will loop through each kit specified in the config until it can give one to the player.

These auto-kits adhere to the same redeem rules as claiming them manually so they will be subject to things like Maximum Uses and Cooldown time

Here is a example of the formatting used in the config

"Autokits ordered by priority": [
  "example1",
  "example2",
  "example3"
],

It is all in the documentation. it uses the oxide permission system , you include a permission when you create a kit and you grant those permissions to those players/groups you want to redeem them. As far as i know you cannot make the autokit anything other than default because it is given on spawning.
Any other kits such as vip. mod, admin or those created as rewards can be redeemed by typing /kit for the cui.