Just finished my playthrough of TW1, going to start TW2 later. None of our weapons or armour in TW2 are going to import though, and decisions don't matter that much. I know some spoilers from the early game, like the first 5 hours, thanks to a translation of that one really long Russian video. They write away a lot of the decisions form TW2. If you get the tattoo in TW2 though, that will import, which is fantastic! No ragrets!
In all the versions there's also a character you'll speak to to set the world state and your choices from the previous games, if you don't import.
Whoops, forgot to post it. No spoilers either.
For the people who didn't see it:




