customising!!

i have recently downloaded aircrafts in blank textures, they are all coloured in white and have the windows, doors and signs...etc.
i would like to paint them my way so i can actually see it in FS2002 like i painted it. how and what software do i need to make this happen?
i would like to paint them my way so i can actually see it in FS2002 like i painted it. how and what software do i need to make this happen?