Welcome.
If you are on an Intel Mac, there are a few minor glitches with AC 10 ... and of course, you should make sure you did install the Intel version (available by download for US users) and not the version on the distribution CD/DVD which is just for PPC Macs. (Starting with 11, the DVD contains both Intel and PPC versions and also supports Leopard.)
Learning in a vacuum is not a great idea, unless you are one who learns well and quickly completely on your own. Your reseller should have provided some introductory training? Well worth it to seek additional training which has the side benefit of interaction in person with other users at lunch/etc. May well be a Dallas users' group too?
Some resellers offer online training included in their ArchiPlus subscription cost, for example all resellers in the GraphisoftWest region of the US:
http://www.graphisoftwest.com Others have a regular class schedule, for example
http://www.digitalvis.com
The 11 new features are listed on the GS web site and discussed at length in these forums - use the search function or browse. The 12 features cannot be officially talked about yet by those in the know.
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB