Having watched many a let's play, I think you should outline your goals for this particular Let's Play. It makes the experience a bit tighter and more defined when the audience knows what you're working towards. This is often done by establishing a little bit of the character and their traits, their quest, and so on.
I dunno. I kinda disagree. That's more for longer video LP'rs like myself who have an established character and story, it seems to me this is more of a experience this game with me sort of play.
The goal, so to speak, is to play a game renewed with mods, and as Ivory said, for viewers to experience that with me. If you mean in-game goals, like specific quests, I'm getting there... I just need to make my way out of the middle of nowhere first.
In terms of the character, I sort of figured I was the character. I do explain the build a bit in the video descriptions. But I hadn't thought of traits or a backstory for the character, because the point of this playthrough isn't to play as the character, or to make choices for the character—it's to play as me and make choices for me, because this is a new experience, for me.
I do see what you're saying, though. Any LP is more interesting with a more interesting character. So I'll have a think on that.