Well, I never follow tutorials. The first reason why I don't is because if you don't understand what you are doing yourself then you will never get it and then are stuck doing what everybody tell you do it instead of fixing it yourself.
I'm going to give you the basics of DOSBox. The experience you got following the tutorial should do the rest and help you a great deal to understand what you need to do for the other games.
At first when you start DOSBox, you get a Z:\ prompt instead of a normal DOS C:\ prompt. You then need to mount whatever directory you want as your virtual C:\ drive.
I think that the tutorial teach you to go edit your autoexec section in DOSBox init file so you can set up the right directory automatically. That's not exactly the best way to do this. The best way would be to create a special directory in your real C:\ drive, like "c:\oldgames" for example, and then copy all the games you want to play with DOSBox in that directory. Then, if you add lines in your autoexec part in the DOSBox init file, it should load up c:\oldgames as your virtual C:\ drive, so you can access all your games from the same starting point.
When it is done, it the simple matter of entering the right directory for the right game (either look thru Windows to know before hand, or use the dir or dir/w or dir/p command to list all files and directory) and find the right file to start the game (usually ends with .exe or .bat or .com).
Hope that helps! If you still have questions, don't hesitate to come back and ask around for answers.
