How to make an Inventory Hotbar (C#)

I have been wondering recently how to make an Inventory Hotbar with only 6 Slots. I already have a Canvas UI Image created that has the design of the inventory. It looks like this: [http://prntscr.com/hyrhuq][1]

   This inventory system should include:
        - 6 slots with a quick hotbar system as if when you click the buttons 1, 2, 3, 4, 5, or 6 it will switch to that slot number.
        - Pickupable items when you walk over a item you should be able to Press E when you want to pick an item up, and if the item is in the hotbar, you should be able to drop the item when you Press Q.
        - If you have the item in your hotbar, and there is multiple on the ground, you should be able to stack items.
        - A system where when the item is picked up you the hotbar will have the icon image of the item.

I will be paying, we can discuss a price either comment or message my account privately its your choice. Thank you and it would be much appreciated for your attention.