You might want to read the Dark Empire trilogy before heading into Crimson Empire, because the latter references/builds off events from the former. And if you’re going to read the KOTOR comics, you should read the Tales of the Jedi comics first, since again, there’s connective tissue between the two.
As for some additional suggestions, you can’t go wrong with the Archie Goodwin/Al Williamson comic strip for sheer space fantasy goodness. And the Marvel comic from the '70s/'80s is fun too, though it gets pretty dire after the events of ROTJ.