Help with CNC. Build box

Hello everybody. I really need help.
I just started studying modeling and I have problems with that. Maybe someone can give me tips and advice.
I want to make a box measuring 200 mm long, 100 mm wide and 80 mm high. From plywood 4 mm thick. I want to make a spike box. In which program is it easiest for a beginner to do this for CNC? I could use a laser for this, but there is one problem. I need a cover with a cut plane. The cover should be 200x100 mm. And in it the hole is 198.6 mm by 98.6 mm with a depth of 1.5 mm. How do I do this? I will be grateful for your help. And if someone can clearly show how to do it, I will be incredibly happy !!!
Sorry for my English!

Unclear what you want, try scouring the internet. Tinkercad is good for designing and Fusion 360 is a CAD program that has CNC capabilities too.