Dragon Age Keep help

If you load up DAI or DA2 and check your completed quests log, it should have the information you're looking for. For unencountered characters/events, I just leave the defaults. 

I don't think TLC has a huge impact, as far as I'm aware there are just a small number of war table missions, but I personally haven't explored this much. 

Well, if you want to refresh your memory, it is probably best to visit the Dragon Age wikia:

http://dragonage.wikia.com/wiki/Dragon_Age_Wiki

The complete quests and outcomes are discussed for DA: Origins and DA2. But there is no quick and easy site with detailed information specific to each decision in the Keep. But use google as a few gaming sites like Kotaku did some articles on some of the various decisions.

I played a couple days of The Last Court before I got bored of the pay to play (or don't pay and wait), but so far I've seen only minor references in the game to it. So it is not necessary to have played it to enjoy DAI. And no information related to it is imported from the Dragon Age Keep.