[Lex]

Well... Internet, of course. That is my first line of call.

If I am picky, or I think the internet source is not reliable, or am designing an especially detailed model, a good idea is to find dedicated books on the subject. These will normally be much more comprehensive and accurate than any internet source, and will also provide plenty of images for detail reference.

If you still can't find blueprints, then it will be up to yourself. Get plenty and plenty of photos, examine the aircraft from multiple angles. After you settle on the general planform in each direction, try to use silhouette, lighting and shadows to identify how each part of the surface curves. Also, use your knowledge to approach the shape from an engineering perspective: what is this part made for and why should it be shaped like this. Reverse-engineering is as difficult as it is powerful, try it. The early jets sport relatively simple cross-sections. You shouldn't have much issue figuring them out.