I would recommend picking up any simulation model you have already made and do a Bottleneck analysis. There are no special requirements for a model in order to do it.
If you don't have anything yet, maybe just put 5 processes in a series production and give them different processing times and see what you can do to improve the output keeping the same rate of input from the source.
See 'Bottleneck Analyzer' in help.
Also see Start Page> Small Examples> Tools>Wizards>Bottleneck Analyzer
You can also try to find some exercises in the book by Steffen Bangsow.