Thanks for your comment! I'm improving the helpers and adding more information about the signals in the next update.
For signals and signs this website is an excellent (and quite dense) resource. Please see sections 2, 13 and 21. Note that each section has multiple pages and you can access the next one from the bottom right corner (although for sections 13 and 21 the first page contains all the information relevant to the sim).
For driving the trains, see the railcar website. Nothing beats this video though, if you have 20 minutes to spare! The startup procedure has been greatly simplified in the sim but the rest of the video is very useful.