[How to do a randomizer?]

I don’t understand your question

[I need a Item Join SKript]

Okey that isn’t that hard:

on join:

      send “ Welcome %player%!

      give player iron helmet 

      give player iron leggings 

      give player iron chestplate 

      give player iron boots 

      give player iron axe 

      give player iron pickaxe

      give player golden sword 

      give player 10 steak

      give player 4 golden apple       

or
 

on first join:

      send “ Welcome %player%!

      give player iron helmet 

      give player iron leggings 

      give player iron chestplate 

      give player iron boots 

      give player iron axe 

      give player iron pickaxe

      give player golden sword 

      give player 10 steak

      give player 4 golden apple       

 

[How do i prevent crafting with skript]

You also can prevent specific crafting recipes:

on craft of a diamond hoe:
       cancel event
       send “You can’t craft this item!

or you can prevent specific crafting recipes in a custom world:

on craft of diamond hoe:

      if event-world is “world_the_end”

      cancel event 

      Send “ Hey you can’t do this here!”