Assuming you would like tips on how to make a paper airplane that can return back to the thrower:
Use a lightweight paper and make sure it is smooth so there is little air resistance. If your paper is too heavy, the plane will not be able to fly far. Also, if the surface of your paper is not smooth, this will create drag and slow down the plane.
Fold the top corner of the paper down to meet the bottom edge. This will be the point where your wings will be attached. Make a sharp crease with your fingernail or a bone folder. Unfold the flap you just created.
Fold each side of the paper in toward the center crease until they meet in the middle. Again, use your fingernail or bone folder to make a sharp crease. Unfold these flaps as well -- you should now have four triangular flaps sticking up from the main body of your plane.
Take one of these flaps and fold it down so that its outer edge meets with the center crease you made in Step 2. Do this for all four flaps -- when you're finished, your plane should look like a kite without any string attached!
To finish assembling your plane, take each wingtip and fold it inward so that it meets at a point about 1/3rd of the way along its length (see photo). Once again, use a sharp crease to get crisp folds; unfold these last two folds before continuing on to flying instructions!