I am having trouble

So, I want to make a Myth game but I don’t know how to make it so you have a dot as your cursor.

All you have to do is put in a local script in StarterPlayerScripts and change the icon with mouse.icon. You have to require the mouse first.

put this in a local script in starterplayerscripts or replicated first

game.Players.LocalPlayer:GetMouse().Icon = 'THE ID OF YOUR DOTTED CURSOR'

The issue i’m having is I don’t have the ID.

Oh, all you have to do is make a decal of the dot mouse and then get the id then paste it.

You’ll have to upload the Image of your mouse cursor to Roblox. Copy its ID and then do the following in a localscript -

local plr = game.Players.LocalPlayer;
local mouse = plr:GetMouse();
mouse.Icon = "Image ID";

Go to decals and upload the image of the cursor
I’m using this as an example.
Click the image and select the numbers(id) at the top.
Copy the numbers(id)
All you have to do now is paste the numbers(id)

local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()
mouse.Icon =  "6954457593" -- this is my example of an id

919035854 is an ID you can use.