How to go about making a Crafting/Inventory script?

How would I go about making this, I'm very new and need some help. I also need to know how to script the pressing on a button to pick up an item and put it into your inventory?

You're asking for us to make the script, which isn't allowed. I will say this: For the button pressing, use a ClickDetector. For Inventory, I recommend creating a GUI, and a script that manages it.