Gui help

[stiff ice]

So I'm wondering how to make a gui similar to this

i can do commands and event listeners and such and config

but guis

i am terrible at

i can never figure out how to space the items out

or how to make the items clickable

[real cradle]

I use this for sorting out the items

But it depends on the size of the inventory your creating.

In that case

Diamond sword is index 1
Sappling is index 3

And like that

[stiff ice]

no like the code for it

i use to code with visual bukkit ik how guis work

and the slots and stuff