I had a manual with my Pfaff and got free lessons. I also sew and use my serger quite a lot actually. I do hems, some slip covers and curtains, and also make decoratifve pillows or quilting accessories. My serger is the workhorse there.
I agree, get some classes as the principles are universal to all machine.
I did rewrite the direction and put on my computer and then printed it out. I used color to highlight the different threads like where the color is on the serger. Several friends have used my instructions as they are direct and easy to follow.
There are some really good videos you can get. I actually bought a set years ago and we still refer to them for specialty things. I imagine there is stuff online also.
I do use one of those blue dental cleaners type thing - a plastic piece with a loop to clean tween teeth? - and have it hanging from the thread stand so it is always with the machine. It makes threading a whiz.
ali