Hi Samuel,
I couldn't find any documentation for end to end setup of the Development environment.for Work Manager on SMP3.0.
The best information I could find was Soren Hansen blog -
http://scn.sap.com/docs/DOC-56329
Based on this thread though we now know you don't zip the contents and deploy it via the SMP Admin panel (step 7 & 8)
Cheers,
Stephen