The documentation for using logic apps is pretty sparse especially considering this is a complicated product. consider a tutorial-type set of articles. take an api app (both .net and java) that produce and consume values and have a trigger. start with a simple flow that takes no input and produces an output. then create a flow that uses a manual trigger and have its outputs used by the api app to do various transformations. an example of this would be a string for an input, one api upper cases it, another lower cases it and a third concatenates those results. then create a flow with logic, if true one branch and false another. again you could use strings to demonstrate this. then create a flow with looping. amazon swf, which has about 10% of the functionality of logic apps, probably has 10 times the amount of docs.
Thanks for the feedback.