Resolution / texture resolution on TV HD / 4K

Hello , - adding this question in Content Creation as well as Rendering. appreciate the help and guidance

i would like to bake my final result in the highest resolution , including avoiding pixels for materials with emissive
it will ran on a 40 Inc 1080P HD TV
any ideas how to plan it? would i need to notice that all assets are using 4k/hd resolution?
anything in world setting to take into-account? packaging final settings?
anything adding on post processing or others?
could not find anything regarding it on the DOCs in UE site