Wow. Thank you for posting those pictures. That looks like a lot of work! Good thing you had some help. You did it right. I would love to see some updated images. Seems like many people are building custom sheds. Even Peter Gabriel is transforming sheds into music studio's. Costs much less than...
Well, my best advice is to never assume anything. Every county has different restrictions. Try visiting this link on how to get a permit for a shed.
This probably sums up the steps best.
I am looking into transforming my storage shed into a man cave. Seen many pictures online am stoked to learn more... I look forward to learning new things. Who knows, maybe I can help others too!