Hmm… well first would love to point out that the engine interface is extremely intuitive and friendly. (just for the record, for the people reading your post not get discouraged) However maybe you can’t follow a specific workflow as other “topics” because the game development process is a bunch of skills put together.
But let’s assume you just want to be a solo developer. Then you’ll need to be Guru Level Designer that understand the basics of everything. It will take quite a while.
However if your game is not some flappybird style all relying on GamePlay repetitive game, otherwise you’ll need content.
Content is created by people with specific skills. The knowledge inside the engine can only optimize the look and the behavior of that content, but you still need it.
What is your project plans? What kind of game it will be? What exactly you want to create? From type of game to type there’s a huge difference.
http://creativeskillset.org/creative_industries/games/job_roles
Here the job roles that would be good to know first.
However, the main workflow is different for every game, but… in the end you need a good game design document so you create an idea in your head and help other people join you later eventually. If you include Concept art that will be even better.
After that you either go for storytelling or gameplay mechanics documentation.
Once you finish the paper work and illustration, you’re trying to explain the idea and put some reference for the programmers and prop artists with the storytelling and the behavior in correlation with the level designer.
That’s the low budget way in my opinion to start something. If you really want to do it the right way, you need to fulfill a lot of more positions.