Reccomendations for 2023 WRX Premium

I've recently bought a WRX, and it will be the first car I intend to mod for the foreseeable future. I want to start as soon as possible. Money should not be an issue, but I want to know which mods will be the most optimal, and what precedence I should start with.

I'm planning to get an exhaust kit for it, though I don't know which one to get.

I want to be able to do these mods myself as well as exterior mods (bumpers, grill, etc), but I've never worked on cars before and would like to learn over time with this car. I would like tool recommendations, auto shops, online references, tutorials, etc., anything would help.

Thank you!