If you want to begin with Simulink, but not really sure how, this can be a good point to start with. You have an HTML to show the steps you need to follow, and 6+ models to show some of the basic abilities of Simulink.
This example starts slow, and then picks up toward the end. There are six "Begin Here Models", a few tasks to accomplish, and the complete models of the results.
Also includes a model for Stateflow, and one for Code Generation - if you have the licenses for those.
Based in part on the "sldemo_househeat.mdl" which ships with Simulink.
Instructions: Simply unpack, and run "start_LearnSimulink".
Download apps, toolboxes, and other File Exchange content using Add-On Explorer in MATLAB.