I dont understand what the block is supposed to look like......the pics are hard to comprehend what youre trying to accomplish.
Autocad is a very advanced proggie to try to learn for a novice.......from what I hear the learning curve is about 6 months average.
Maybe you should try a simpler cad program(there are some nice free versions out there) until you get the basics down, and then adapt what you learn to Autocad. Maybe this will help in learning.
I prefer to use Solidworks myself........gotta love it!
See if you can whip up a better render of the block, and Im sure youll get many replies around here. We all love to give our opinions.....good or not