If it helps, there's very little that carries over between the two games. Without any spoilers, you lose your gear at the start of the BG2, most of which doesn't carry over anyway. You will start with the level you finished BG1 with, but BG2 boosts brand new characters to a certain level anyway. And I don't think the games track decisions made throughout like modern RPGs do.

That said, I played it years before Beamdog released that interlude DLC, so maybe things have changed in their Enhanced releases of the games.