What version of AutoCAD are you being asked to use at work? You can probably find a book on line for any version they are asking you to use, and most every one can be ordered for delivery in just a couple of days. The idea here is that almost every one will cover the basics you'll want to know in the first chapter or 2 or so . You can think in terms of the basic commands you want to use and type them in at the command line and work your way through it. Like btrueblood mentions, most every one or 2 letter commands (L = Line) etc, also still work. That'll get you started, and just a simple re-read of the 2 or 3 chapters at the front of the book will help you remember alot (like how Offset works, or how you need a basepoint AND a destination point for Move AND Copy, etc.) You'll do well.
Now here's something of a surprise for you - ACAD 3D is VERY strong. Learning how to make your assemblies in 3D and extract your Assembly and component drawings to Paperspace viewports works VERY well, and ANY really familiar workflow creates faithful followers ! I like AutoDesk Inventor better, but I can knock out a completed Assembly with all Subassemblies, Components and ALL Extracted Drawings very handily in basic AutoCAD !
Surprise number 2 ? Well, a number of AutoCAD workalikes can be had for around $500 that do a decent job on your computer at home , are stable, and the drawings load right up into your AutoCAD at work ! I like ProGeCAD, but BricsCAD is strong too ! So your options are many and varied, and a $500 copy of ProGeCAD or BricsCAD or any other of your choosing, can help you learn your WORK AutoCAD since pretty much ALL of the commands are identical !
Ok, Good Luck and let ust know how it went ?
Charley.