Texture kits come in 6 types with (2 extras for certain ships, just Standard rebel ships i think only i think. not the Heavy Z95 or the Advanced X, but dont hold me to that they just the ones i know about lol) These change the paint patterns on your ship for all freelance and rebel ships, They do not work on ANY Imperial ships. IF YOU JOINED THE NAVY YOU GAVE UP INDIVIDUALITY!!!! :-P
Paintkits change the paint colours of your ships.
Each kit alows you to change one Primary colour and one secondary colour.
To use either of these bring up the menu on in the item in you inventory choose the apply option and chose the ship you wish to apply them to. You can do this anywhere you like, but i prefer to do it at the star ship terminal where you can get a good look at what you are doing from the ship select screen.
Certain ships including............(i appologise if i miss any and for the spleeing) the Rebel Z95, Freelance rhickzzzzzzyamacallit, and the imperial TIE advanced have the option to apply chassis modifications, these are winglets created by a shipwrite (for the most part i think they have to be ordered, being a one purchase deal and requireing space resourses to make i dont know any SW off hand that keep them in stock) On the Z95 they give the appearence of lonf thin winglets down the side of the nose. One the rhickzzzzzzyamacallit they give the appearence of small uprights on the wings. And on the TIE Advanced they give the appearence on stubby long winglets along the folds of the side plates.