The workflow is:
1. Load objects into a new project
2. Setup environment
3. Setup a camera
4. Create materials
5. Assign material to meshes
6. Press 'render'
It is quite easy.
If you want to know how to do those steps:
Use these keywords "maxwell render 2.7 documentation pdf" there are some pretty good PDFs (which look like the official manual?!) for maxwell.
I wonder why _I_ didn't get one of those manuals. I downloaded maxwell as a DMG archive (OSX) and believe that the archive didn't have such a manual.
Edit: http://www.architektur.uni-kl.de/digita ... nglish.pdf