Been looking for a booklet that i had given to me by my old college lecturer,presto cutting tools its got some good info in there which would be valuable to you.Have a look at this link

http://wapedia.mobi/en/Speeds_and_feeds

About halfway down the page there's a chart for cutting speeds,this is how you work it out


Mild Steel(e.g.)

diameter of material(50mm) x pi(3.142)=157.1
Cutting speed of material(100)x1000=100000


So, you then do this 100000 divided by 157.1 and you should get 636RPM this is a good benchmark to start,dependant on insert wear,condition of machine etc.Doesn't have to be that exact speed just some where near.I would personally go a bit faster than that figure.We use a company called braemar in work for coolant think they're from sheffield way,hope thats of some use to you tabetha.Can't remember what the 1000 figure is for think its surface area or distance,been a while since i've done it!