Setting up blueprints in 3D Studio Max Well pretty essential in this tutorial is naturally having actual blueprints... I picked the one that I just (re-)made an hour ago, the ones for a Ferrari Enzo.
Now crop all the different views in PhotoShop so that they fit exactly in the image (see below). I have made a small error with the mirrors (the Enzo has two differently sized ones, but I used one for the front and one for the rear, and naturally picked the two different ones...:), so the front and rear are not exactly as wide. Doesn't really matter, just that you know.
Alright: now save these images (or the ones from your blueprints) with some easy names, like bp-front.jpg, bp-side.jpg etc. This will come in handy...