The next most important thing is to try and marry up the textures correctly. All I can really do here is to give you a list of the basic textures that I use a blend of in my modules. Just remember to always rotate when you place these to avoid patterning. I will also supply the texture size that I use (min, med or max).
Fields: in this order of application
Grass a (max) (UK textures tab)
Grass a b (max) (UK textures tab)
Grass a1 (max) (UK textures tab)
Grass grn grd (max) (Aus textures tab)
Lay down a general cover of Grass a. Next while rotating the following texture run the mouse around in swift movements creating a random pattern then repeat with the last 2 textures.
Ballast:
Ger Gravel 01 (min) (Germany texture tab)
Other than these textures, go nuts there’s heaps of great textures out there and you can use up to 256 in any route, I’ve only given you 5 basic ones that leaves 251 before your map explodes.