Idea For a Story! The Start of Something Big?

I have come up with an idea for a story that I think I can get to work! I feel like I need more schooling in how to properly write a story but I'm going to give it a shot anyway. Granted, this is just the groundwork, and I'm going to need to develop so much more to get this to work. The story follows a man in his late 40s that's well educated in the arts, philosophy, and psychology. He's mostly self educated, for he looks down on the impressions people get from the biased lectures of others. He has a loathing attitude on people, believing they're inferior to him and disgusting, and those that aren't inferior he's afraid of. His loathing attitude is hidden for he also expresses appreciation for beauty and has many redeemable qualities. He's active physically, sexually, and somewhat socially even though he suffers from social anxiety. The story might be written in first-person. This smart, opinionated, insecure man is an atheist and his meaning in life is his collection of knowledge on the arts and how he's able to interpret and analyze them.

This is where my idea unfolds into a story; the man begins to loose his collected knowledge slowly and now must come to grips with the horror of living in a completely absurd world. How he begins to loose his knowledge I haven't thought up yet; maybe medically, mystically, or unexplained. The story is supposed to be existential. There's a lot more I need to think of such as other characters and tone and stuff, but this is the base for what I want my story to be about. I'm also thinking up of a back story for him as to why he feels the need to collect knowledge on art. I'm going to update when I come up with ideas that I think will work.