Here is a really useful site for what colors to paint ships. You can get lost in there...
Assuming you mean a USN carrier? Any ideas which one? Scale?
Probably 1/48, correct? Probably Measure 21 Navy Blue. By mid 1945 most carriers were Measure 21 Navy Gray.
http://www.shipcamouflage.com/index.htm
Weathering, yes and a lot of it. Rust, storm damage, battle damage, wear and tear, sun bleaching, some dirt.
Tie downs depending on scale there are various PE sets out there. Or just approximate them. it's a pretty fine level of detail.
Eager to see more.