[galaxy-user] how to create and use workflows

I am a new Galaxy user and I am trying to find out more about creation and usage of workflows. Once you have a workflow, its usage seems to be quite straighforward. But for the workflow creation, I am still looking for more documentation. I am especially interested in these topics:

* How can I start a workflow with data from my computer if the upload step is not available for workflows?

* What should I do for my new tools (added in my own Galaxy installation) to be able to participate in workflows. Anything specila to add in their XML description file perhaps? [Perhaps this question is more for the galaxy-dev mailing list?]

* Is there perhaps more documentation on Galaxy workflows anywhere?

Thanks for any help, Martin