Most users that have either AutoCAD Architecture or AutoCAD MEP either use it as AutoCAD or don’t know much about the features that they have. It’s natural in the busy world to do what you need to do to get jobs done with the software.

Where do you start?

Start a new template.
Template files are .dwt files and drawing files are .dwg files. They are not one in the same. Be sure you begin with a template for your program and insert your own titleblock. Also be sure to set it as QNEW. Start using Tool Palettes. Sign up for a webcast on this from Steve Bennett on his blog, 2D or not 2D, possibly fixture design.
Use this fresh start to go over or set up CAD Standards. Here are some good ideas from Mark Kiker.