beginer blender problems

Hi guys
im pretty new to this and i have been having problem after problem. first is that i have made a scene with a barn and put it under a nice terain and i colored the roof to be white and shiny in the materials tab and when i render it it comes out brown? second when i want to texture something in uv mapping it wont unwrap it when i clearly mark the seams and everything. third does anybody know how to succesfuly texture fluid?
any help would be great!

hi,

as we could only guess, what went wrong with your scene, the best way would be to post a blend file here or some appropriate screenshots showing your materials settings + seams and unwrap.