Some funny responses in here. I always though "big" was a relative term in the machining world, hence why people speak in terms of lenght-to-diameter ratios's and such. In my world, I'm happy if I can fit a big ol' 2mm hogger on a given part.
Or in other words, you call that a knife?
Do you have a link for this cutter? We have other Harvey stuff here but I didn't know you could get 7-flutes tool this small.
Our shop uses OSG cutters for the smaller stuff, I use their 2mm diamter X 8mm loc w/ .008" corner radius 2-flute all the time.
I would probably leave more like .001"-.0015" roughing stock. For a normal cut I would run it at your full speed 12,000rpm but if you have a large area to cover would probably be best to slow it down to more like ~10,000rpm to make sure the cutter doesn't wear out before you finish a full pass.
Stepover anywhere from 10%-30% of the cutter diameter and with the 2-fluters you can run a fairly high chipload like .001"-.002" because of the lower depth of cut. But with 7-flutes you might not have enough chip clearance in the flutes so might need to experiment here.
As far as surface finish goes, you pretty much get what you get but it should be decent in S7 at 56rc. We run "MQL" oil misted into the air blast which does help surface finish, you might be able to rig something up for this or could try spraying it onto the surface manually.