The tools that you need to make the mold.

Black Or Blue Marker

Mailing tape or scotch tape

Clear plastic wrap

Scissors

Step1: Place the plastic wrap

Use a sheet of plastic wrap long enough to tie in a knot under your chin. The plastic sheet should cover the entire area needed. It helps to spray a little water on your scalp or wash your scalp, that would hold the plastic in place.

Step2: Apply layers of tape

After the plastic in place and tied, place several layers of strips of tape from front to back and side to side over the plastic. The tape can be scotch tape or mailing tape. This creates a semi-hardened mold of your head shape.

Step3: Draw hairline and Mark "F" on front

Use a black marker to draw your hairline all around. Your front hairline will normally be about 4 finger widths above of your eyebrows. You can draw arrows to indicate the hair style which you need. Mark a letter"F" on the front of the mold. You can also mark a letter"B" on the back of the mold. Also you can write your name in the middle of the template.

Step4: Mark part and hair direction.

You can mark the part and direction you intend to comb your hair. It's unnecessary if you order the freestyle. As the freestyle could be able to comb in any direction. 

A hair system would be good match for you when making refer to the mold.