Difficult to answer with the information provided.
Most important is what material are you cutting? Big difference between Aluminum and 316 stainless steel.
For aluminum I would not go more than 20% stepover width as a starting point.
I recommend that you find an online cut calculator. From there you can plug in the material you are cutting. Then you can try different combinations of depth and width of cut, also RPM and see what is likely to work with the machine you have available.