Laser CNC - first steps.

Hi all.

We are going to build our first laser cnc michine, based on linuxcnc. We alredy have price for optic laser generator 1kW and laser head. We will use similar laser to thet in video


But we don't know anything about proceses for laser cutting.
Does any body can tell some details of working with lasers? What technical process for cutting? How to control such laser and how to control it's power? How to control height of cutting?

We want to use servodrives for fast moving?

Yes, motors is the second qestion. It's very interesting to know details for controling that lasers. Maybe any body have any schems for them to look what signals we should have under control?

I looked in different manuals and it seems that controlling fiber laser doesn't have any differences form CO2 laser.
Laser controls with buttons on/off and PWM power input.

But very interesting one moment about focus controlling of laser. It moves laser head in Z direction dependently on the distance to the cutting shape. Such controlling systems are present in the market and ready for use with amplifiers of distance sensor. But what sensor they are use? Does any body knows it?