TTSIM or the demo is a good place to start. http://forums.tradingtechnologies.com/forumdisplay.php?f=10
Go with Ninja Trader it is a lot easier and they have online video tutorials. I could not get used to X-Trader either so I went with Ninja.
For me, to using ninja trader, I found information video-tutorial into the original web site, and (i sugest to You) into YouTube, some videos too, I hope it will help
I've been using x_trader for while now and i must say that I am impressed with it. I used easyscreen prior and find the MD trader a great interface. I'll do my bst but if you want any help email me.