I machine brass exactly the same way as I machine aluminum. However, for smaller stuff like this I’ve found it best to keep things on the conservative side. I use 1/8" and 1/16" flat end mills for most of the stock removal. 10-20 ipm. 15k rpm. Light cuts. I think mine are 2 flute. For the detail work I use 1/32" end mills and 60d v-cutters to get to those sharp edges. About 10-15 ipm for those bits too. 15k rpm with light cuts. Like I mentioned, prototype your gcode in delrin first (or some other low cost prototype material). If everything looks good then plop some brass down.
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