Hi, I have personally produced a zillion of these types of animations. Some explainers, and others re-caps (here's what we did and here's how it helped client increase sales).
Can I just say, SCRIPT IS EVERYTHING!
Spend 80% of your time writing your script. Read about how to do this properly. Write, re-write, read it out loud, time it, read it to your friends and family.
Everyone is always focusing on "where do I get the VO recorded, Fivver?" or "Does oDesk work for cheap visuals?"
Fuck all that. Figure that all out once you've nailed down an awesome awesome script.
In order of importance it goes:
