Please help me with a crafting system and inventory

Help Requests
1

I Want to make a simple Crafting System and Inventory, i have an idea for the inventory, when you have an Rifle it should take 3 spaces and a pistol 2 spaces and ammo and resources 1, the thing is… IM DUMB and dont know how to make this, if anyone could help that would be nice.

@TinkerSmith @“JR 01”

2

crafting can be done with collisions switches and global values for crafting,for inventory i know nothing about saving the items but the custom space can be used with global values and switches
other tghan that my knowledge ends there