3d interaction

I am trying to make a 3d model of a to be redesigned interior of a building…after i get the graphics for it, what would i do to make it capable of interaction?

i think you should buy the blender gamekit, its very informative.(when i saw it i looked through it and learned somthing new) this is a VERY big subject, but you need 2.25 or lower.

EDIT: you also should check out the walkthrough demo file an blender3d.org.