"Default kit image URL": "",
    "View kit icon URL": ""

hello
how can i make each kit having a seperate kit?

I think you mean ," have each kit with its own image".  (?). Because of icon problems for kit items i took a screen shot of each completed kit inventory (with all items in main inventory section)  and uploaded it to  Imgur,  I edited it to get rid of unwanted details and then downloaded the link into the

"Default kit image URL": ""​

This is the ADMIN view of images when typing /kit  (NPC kits are optioned as "hidden - true" so dont show contents)

https://i.imgur.com/g9cXIXT.png?1

and this is the PLAYER view

https://i.imgur.com/CvGOziI.png?1

You can of course created or upload any image to edit into Imgur and use that as an image url,