I need help making user interface for an inventory system

Hello all, as shown in the title, I’m currently trying to make an inventory gui system, like arcane adventures/ arcane reborn or world of magic.

I believe I know how to make the server sided of it, such as getting the items or adding items to the inventory, however I have no idea how to make the visuals, such as when an item is added to the inventory it makes a new frame in the interface and moves it around, and I’m unable to find anything on it.

If someone could point me in the right direction or help me go about creating a interface/localscript to do this it would be appreciated.