I don't follow the first question. If you are installing for the first time, then you must use lgps that have not been altered before and then the backup folder is used automatically after that. READ THE README ON THE LICENSE PAGE.
As for second, the DLPB selection is what I use, I do not install all of them, and indeed some are different mods for the same model.
You can install everything, look down the drop box or just tick them all.