The first thing to do is to head over to the documentation site, especially the Developers section.
The source code for Wizkers.io is located on Github and is of course a great reference. Use this forum category to ask any question.
We also work with several companies who use Wizkers.io to build apps for their devices, see the Showcase section on the main wizkers.io site for more details. You can contact us directly for more info as well.