Have you read this tutorial
and followed the links provided to other tutorials in it ?
It's basically answering and showing you most of the tips and discoveries you've made by yourself so far.
You're not the first "pro" to come by the forums and overlook the documentation already available.
I'm aware you may not have the time tu fully complete the tuts, but you should really try and have a good look at them.
They will display a great deal of Construct 2's workflow and your experience as a coder will help you go through this process faster.