about the best tip I had from a very good pillion was they should gently lean against the rider as you approach twisty bits. This gives both rider and pillion a feel for what each other is doing and leaning forwards helps balance the overall bike better in corners.
Try it, it really does work.
On straights the pillion can sit back and relax a bit.
First time you take a pillion, try to find someone who is reasonably lightweight and has done it before. You'll have your work cut out with trying to get used to the extra weight and rear bias without having to teach them what to do aswell.
