Yeah, extra care needs to be taken for outdoor bikes, especially if you're close to the ocean. I'd start soaking those CR bolts with PB Blaster or something right away so that they can be loosened when you decide to change them.

I wax my bikes once a year and they live indoors with me, if I had outdoor bikes I'd likely wax once in spring and once in fall. I also spritz stem bolts, etc with WD-40 often, as they tend to collect water and rust.

I'd also look into treating your frame's interior with some Framesaver or similar.

I usually ignore chainring and cog rust.