Oldtimer/newbie coming back

Not really… on the one hand

On the other hand item skill modifiers have been added to the base game, which provides you with options that did not exist, when the base game compendium was created.

If you have a basic grasp of the game you should be able to breeze through the main campaign on the first difficulty. Get some inspiration from those build guides and tweak them with the knowledge @Stupid_Dragon compiled in his guides: