The mill can be a little tricky to move around the axis. Here is a quick overview on how to move each axis. Remember: imagine you are moving the spindle even when you are actually moving the table.
This is the jog shuttle controller, this little guy is very helpful because it can move our tools down to the thousandth of an inch. All you have to do is adjust the speed
In this video, Titan demonstrates how to set many fixture offsets to different Z heights utilizing a 3D Sensor, while zeroing all tools to a single height. This technique is especially good for those that do not have a probe. That said, we do have a probe. It is called a Haimer tool. The haimer is used to adjust the coordinates of the machine in relation to the tool/piece you are trying to mill. G54 is the function in the code that references these coordinates as your zeroes.