Can you help making a Shop Gui, Inventory Gui, Money Gui for us?

We need a Shop Gui & Inventory Gui for our Fantasy Roleplaying Highschool (Mermaid High) and also we need a Mermaid Custom Ui Design that work well with the Seashells that are mesh part. As you see is the Instrucction down below what we need

Requirements: -The system needs to save -MUST WORK FOR MOBILE USERS -Easy for us to add items in the shop ourselves -We want the items to be models/parts/meshes that we’ve made via blender. -We also need a script that lets you wear the meshes/faces as an accessory like skirts/hats/hair/faces ETC.

We can pay you no more than 1k!

As you see, How we can't write that are looking for, I copy a reply of Calilies on Devforum and I paste here, that's what I need as well as I ask callies on Devforum!