Yeah, that might be a good idea.
Having concrete tasks to do is definitely very helpful for learning, so I second that suggestion.
Marron (OP), try to think of an extremely simple game to get start with, something that can be completed with only slight modifications to one of the templates. For example, your goal could just be to go through some maze or set of physics obstacles to reach a goal point and then display a “win” message or particle effect and after a little bit close the game.
Sometimes it’s also useful to just make little individual devices or mechanisms. For example, create a trip wire (a little particle effect line, plus an automatic alarm that goes off if the player touches it).
Think up as many small independent mechanisms you can and make them. After that try getting your mechanisms to interact as part of a more cohesive whole.
The ContentExamples project you can download in the marketplace has an especially high number of examples in the various levels.