Check out
www.practicalmachinist.com . There's a few top name knifemakers that hang out there and a LOT of experienced home shop and pro machinists. There's probably even a forum for your type of mill (Bridgeport?).
A good cheap and not too thick foundational book is How To Run a Mill by Fred Colvin. It's avaialble in reprint for from Lindsay Press. It was written in the 40s, but if you're running a manual mill, not much has changed. Setup and cutting speeds and most of the tooling is the same as it was then. There's certinaly been some further development in materials both for cutting tools and workpieces, but it will give you all the basics.
You can also look here for some online training:
http://mmu.ic.polyu.edu.hk/index.asp
The best thing to do is watch the local garage sales and classifieds and when you see used machinery or tooling for sale, call and see if there's some old guy selling off his stuff. You can often get some great deals on cool tools, but if you're really lucky, you'll find an old fella that will come visit and give you some pointers
I'd recommend buying some aluminum and cold rolled steel and some endmills to start and make some chips. This approach mean's you're going to scrap a few cutters, but it's going to happen anyway so you might as well get used to it now
If you're really ambitious and want to become a rell versed and versatile machinist, buy a copy of the 27th Edition of MAchinery's HAndbook and read it. When you're done, you'll be good!
There's a few guys around here that know how to turn the crank on a machine pretty well
Tell us about your machine.