Guess it is time for me to chime in.
The 706 is a great choice, I had one, now I have the 746Pro. For mobile use the 706 is great. Especially the remote head. If you are going to be using it while parked the 746 would be nice, bigger display etc.
Antennas, the High Sierra is great, versatile, easy to use. You could go new with both for under $1000.
Talking and driving, really depends on the person. Some folks are distracted by a windshield wiper. Some can multi task. I find a conversation on a late night drive home is much safer than just driving. Keeps you alert.
Getting licensed, ARRL is a great resource, they can help you find local groups, they have manuals to help you learn and they are the voice for the ham in dealing with issues, whether it is in Congress or to the manufacturers. Well worth the annual membership fee. Kind of like FMCA for hams.
I was licensed initally in 1964, then again in 1980 and continually since then. I hold an Extra class license and accreidted to administer exams. I was also the Assistant Section Manager for RI before we moved for the previous 3 years.
Nevertheless, all the above is JMHO, your mileage may vary.