To change the background (other than using a plane or other geometry) go to the rendering menu and choose environment. There you can edit the 'sky' colour, or put a picture (say of clouds). But if you're using Brazil then this might be slightly different, and I can't help in that scenario as I don't use Brazil.
Have you had a peek on dSRC's forums - they are very nice and helpful, and Ian.H has more experience with Brazil than me. I learnt a lot about LFS rendering there. Also Master Skinnerz has a forum devoted to rendering, and is popular with many of the great renderers here, so more help may be available (don't forget to search
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Glad you're sticking with it. It's NOT easy this rendering malarky and it would be all to easy to give up.