Before you try tying tzitzit to your tallit, it is advisable to practice with twine or heavy string looped around a chair leg.
There are sixteen strands in a pack - four long ones and twelve short ones. Seperate these into four groups with one long one and three short ones in each. The longer one is called the shammash and is the one used for the winding.
Even up the four strands at one end and push the group through one of the corner holes in the tallit