You should be aware that the Dolomites are "shut" (figuratively speaking). End of November is still in that lull between the end of the walking season (October) and start of the ski season (December) and hence you may find some businesses shut.
You may be better basing yourself in Bolzano.
Munich-Innsbruck-Bolzano and return
For getting from Munich to Innsbruck and on to Bolzano and return trip from Bolzano to Munich use German National rail www.bahn.de
The Germans operate 5 direct fast intercity services daily from Munich to Verona (and return). If you book in advance you can get discounts on tickets.
Please note the Germans and Austrians www.oebb.at co-operate on rail services/tickets etc.
The Italians do not co-operate with the Germans on rail info. A number of years ago the Italians threw all the toys out of the pram in a dispute over cross border rail services and now "pretend" the german services don't exist even omitting them from their website timetable.
Italian rail www.trenitalia.com
If you are in Bolzano you can get direct trains to:
Merano. There are trains every 30mins or so and the journey takes ~ 35mins
Bressanone - every 30mins takes ~ 30mins
Sterzing/Vipiteno - every 30mins takes ~ 1hr (same train stops at Bressanone/Brixen and Chiusa)
Getting to the Dolomites
There are a couple of direct bus services that go from Bolzano to the Dolomites area
The No. 170 runs regularly (some services only workdays) to Siusi and Castelrotto - sometimes carries on to Ortisei
The No. 350 runs to Ortisei and Val Gardena but not that often. The same bus has a more regular service from Ponte Gardena/Waidbruck train station (every 40mins or so and takes ~35-40mins)
For local transport solutions from Bolzano to Ortisei etc use http://www.sii.bz.it/en (will show those links also utilising local trains)
Cortina is very difficult to get to as it involves a train to Fortezza/Franzenfest then another train to Dobbiaco/Toblach then a bus to Cortina. There is the odd direct train from Bolzano to Dobbiaco
HIRE CARS - WINTER TYRES
I should point out that a car hired in Italy will not come with Winter tyres. Nobody can predict the weather. I, like most people in Bavaria fit winter tyres to my car for Winter (from end October/start November). In Austria it is law that all cars must be fitted with them from 1st November. It would be dangerous to try to drive on snow without them. As it is not the law in Italy any hire car will not come fitted with them. You would have to pre-book them and there is a charge.
If you really wanted to drive around the mountains you might consider hiring in Innsbruck as all Austrian Hire cars must have Winter tyres fitted (it is the law) and at no extra cost.