How do i draw to scale on the thing ? I set it to iso 1:20 but the line is still 2000 actuall mm long lol off the sheet

I presume you are sketching in the 2D environment.

The best way to do this is to sketch on the 2D model sheet. The idea is that you sketch on a scale of 1:1 on this sheet and then use the "2D model view" command to place a view from this drawing on "sheet1" (a working sheet). You can then scale the view by chaning the properties of the view.