Look around on eBay. There are lots and lots of tube testers sold there, and many have the charts with them. With the charts, you'll set some switches and dials as indicated and read the results on a built-in meter. Better testers will test more variety of tubes, and will test more things inside each tube.

There's a few books on tube testing available, and they tell you things like how to get the most out of your tester. I can't recall where to get those books, but I suspect that if you look around on eBay, you'll run across an auction or two that has a link to books like these.

Happy hunting!

Wayne