It is an interesting project you are building…and I’m sure your English is much better than my French.
Starting with the stepper drivers, the TB6600 is more than you need for the Nema 17 motors. So unless you are modifying the MPCNC with larger, NEMA 23 motors, going with a different driver will simplify your wiring and getting the firmware flashed.
The Ramps firmware maintained by V1 Engineering can be found here. The Ramps versions of this firmware are setup for the DRV8825 drivers, so going with DRV8825 drivers will be the simplest solution to getting your machine running. The recommendation on this forum is to set the vref voltage for these drivers to 0.7V. If the term ‘vref’ does not mean anything to you, you will find multiple videos on YouTube on how to set the vref voltage, plus there are also web pages on the subject.
There are two different wiring approaches, serial and dual endstop, and each has its own firmware. With serial wiring two motors share a driver, so a total of three drivers are used. A Y cable connects together the two motors for each axis. V1/Ryan sells these Y cables, but I don’t find them sold elsewhere, so you probably have to wire your own. You can find a wiring diagram for the serial Y cable, plus some other information on wiring the steppers in serial, on this page.
With dual endstop each stepper gets its own driver, so there are wires running from each motor to the control board. You don’t have to install endstops to use dual endstop wiring, but this wiring is reuqired if you want to do dual endstops now or in the future. And wiring your machine this will will save you from having to buy or make a Y cable.
I can find electrical drawings for 3 motors,
The E0 and E1, which stands for Extruder 0 and Extruder 1, are also stepper motor drivers. When wiring up for dual endstop, the second X motor uses the Extruder 0 driver and the second Y motor used the Extruder 1 driver.
In terms of actually running the wires, most people run the wires through the tubing. In addition, either a cable chain, sleeving or sleeving with the tape measure trick are used to route the wires along the side of the machine.
I’m not sure if this info will help you or confuse you. This forum is a friendly, helpful, and responsive place, so don’t hesitate to ask more questions.