How do you make a shop GUI on roblox

so this is pretty simple. Put in a text button in the screengui in startergui. Then use the on click script. If you don't know that go into scripting helpers and they can help. After that in the script do onClicked or whatever you name the function getfirstchild or the script you prefer to use. Then get another gui you put in lighting that will pop up when you click the other one. after that just keep doing that as you want. I don't know how to use significant funds yet but that is the basic gui.