Ok, as said before: with a V9 Navcore you can use basically any map you like - if the meta code is posted.
Simply download what you need and use FastActivate to patch your Navcore and activate the map.
Maybe a good start for you would be to check the TT website, you can find manuals there as well additional info on the coverage of the maps (check the map store, you don't have to buy a map though).
Last hint would be the build in help and tutorial on your TT, check it and the TT shows you how to operate it.
Coming from Garmin it will take a little bit to get used to the different menu layout and functions.