Mavic wheels out of true after 200km, is normal?
It is normal for a new rim to be out of true after first rides. Once the first service for the rim is done, it should remain true for thousands of kilometers.

It is recommended to check a new rim after 200-1000 km of riding.

I recommend using a professional mechanic to true the wheel. It is easy to overtighten some of the spokes, if you don't know exactly what you are doing.