Gui Control for Skill Tree Help pls!

Okay, I create a skill tree in my game, and at this point I have a question, all the guides that I looked at the skill tree were created from the desks, that is, the camera simply became on the desks and so the player progressed, I decided to do otherwise. Namely to create all the points and all the menus in screenGui, after which I have a question.

How to make so that the holding the left mouse button, the player could roughly speaking move around the field, and scrolling the wheel of the mouse to move closer or farther away from the desired position?