Make sure you have installed a Wwise Authoring Tool version compatible with the Unity Integration on your PC.
You'll still need to set up your events and switches usnig Wwise Authoring Tool in your WwiseProject.
Then, integrate them in your Unity project by calling the C#-bindings to the Wwise SDK API in your Unity application scripts. The signatures is similar to the native Wwise SDK API. For example, AK::SoundEngine::PostEvent() will become AkSoundEngine.PostEvent().
See the bundled IngrationDemo unitypackage for an example. Read the documentation section dedicated to the IntegrationDemo. And it would help to read the whole doc, especially the How-To Setup your Unity Project, and Example Unity Scripts sections.
In the future releases, this workflow will be more integrated into the Unity Editor UI.