Bioinformatic analysis & 3D structure - (Mar/01/2012 )
Try I-tasser for protein 3-D structure. Note that you can't get the real structure unless you do a crystallization study.
Gene sequence will give you first off protein sequence (but not necessarily 3-D sutructure), intron/exons, phylogenetics, potentially similar function genes, mutations (if there are enough published), maybe siRNA sequences...etc...
You can get existing protein 3D structure from crystalographic studies on Protein DataBank. You would need a program like RasMol or others to move the downloaded model nad manipulate it.