There's a good furnace troubleshooting guide in this manual:
http://www.bdub.net/manuals/Suburban_Service_Manual.pdf
You might want to spend a few minutes reading through the "theory of furnace operation" part of the manual. It will explain (in great detail) exactly what is happening, when and why. Understanding the "sequence of operations" of the furnace makes looking for problems much easier and takes a lot of the guesswork out of "what is supposed to happen".... It also makes the part about "knowing what's going to occur next" much easier to anticipate...
Once you "think you know what to expect" because it's supposed to be like the furnace in my house, is when you realize that they are two entirely separate concepts and don't operate anything even close to the same way.
Good Luck !!!