Realistic Wood

[Capt.ArD]

for colors, use google, search for pine or something, but i guess a light brown and a more reddish, darker brown would work well.

as per sizing, i can't really help. there is no magic formula to make wood look good. just try adjusting the tiling. if it looks bad too big or too little, don't make it that size.
what may be the problem is that the resolution of your texture is too low. use google to find a good, big picture of wood you like, and use that instead of the max textures. but max textures ar usually pretty good.