10-degree bits have very fragile tips, they break if you look at them sideways. 30 to 60 degrees work much better for PCBs.
Regular end mills are pretty much out of question. Your two options are:
- V-bits and pyramid bits off eBay - cheap but functional.
- Specialized PCB bits (such as PreciseBits) - supposedly better than V-tips but $10 to $15 a piece.
RPMs and feeds: depending on the machine and spindle you have. My "sweet spot" is 8 000 RPM and 150mm/min; yours can be totally different.
Depth of cut: I use a single pass at 0.05mm. Depending on the copper thickness you may have to cut deeper and/or make multiple passes.