When you want to play Tribunal, simply activate it (but I wouldn't recommend Tribunal to inexperienced players, although technically you could play it at level 1). Once you have more experience with the game, you can understand better what the plug-in's do and decide which ones to use (if at all). The Master Index plug-in + Journalfix are nice, but not necessary to enjoy the game, if you are looking for a rich role-playing experience.

You could consider simply deactivating Tribunal, and playing the base game as it is. I have never used any graphics mods, so I can't comment on them. This has always been good enough for me and my personal playstyle (I do play a heavily modded version of Oblivion, because the base version alone demotivates me too much, but that's a different story). The only plug-in's I use myself are Master Index + Journalfix (interesting quests + a convenient travel method) and the Tribunal Delay mod (complete main quest version) which I simply deactivate if / when I want to play Tribunal. Please be aware that you get attacked by these assassins regularly, until you start the Tribunal questline (unless you deactivate them).

Korell: Any thoughts? I haven't used the level 6 mod, but it should be ok - if that's what you want.

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