Hey Lazylizard1,
if you are looking for something about tramming, it might be worth to first click here.
Generally, before ensuring the perpendicularity of the milling motor’s shaft towards worksurface (also called “tramming the router”), it is absolutely necessary to first ensure that your machine is not twisted, because if it still is, tramming the router and surfacing the wasteboard will help nothing, because it will inevitably lead to a twisted wasteboard and to always twisted results after each machining of a workpiece.
It’s only after having eliminated any twist of the machine that it makes sense at all to check for perpendicularity between milling motor axis and worksurface afterwards (also called “tramming the router”).