How to make an object from backpack orbit something in workspace?

Okay, so basically, here's my problem: (I'm pretty new to coding.)

I'm trying to make it so when a player pulls out a gun (in this case its an item from a backpack) something else from the backpack orbits around it.

There is a shotty in the game called The Streets and I want soda cans to orbit it whenever you pull the gun out.

I've got the basics laid out (possibly...)

local player = game.Players.LocalPlayer
----
if game.Players.LocalPlayer.Backpack.Shotty == nil then
    if game.Workspace.player.Shotty == true
    then if game.Players.LocalPlayer.Backpack.Drink == true
    then 

I don't know how to finish it, and I'm almost positive I messed up the beginning.

Thanks in advance.