Decide what kind of monster you want to make
You need to determine what type of monster you want to make and how it will look like. Decide whether you want to give him wings, tongues, extra arms or legs, long ears etc. You should also decide whether you want to give him a shy personality or make him a crazy monster.
Gather the materials
Now gather all the materials for making the sock monster and place in front of you. You will be required to have a pair of socks. In the end you will have stuff to make another stock monster. You can save the extra stuff for future projects. Remember that it is not necessary to have two socks of same design but it is preferable.
Cuts for the head
After gathering the supplies, you need to make cut for making his head. In case you will make his ears, make cuts according to it.
Cuts for the neck
Now make cuts for the neck and you can do this by making a 2 inch vertical line almost half inch below the heel. Then make two smaller sized slits on the sides.
Cuts for arms, legs and other limbs
Next make cuts for the arms. For this purpose you can make a vertical line in the bottom of the sock with cuts for the neck. In order to make cuts for the legs, you need to make vertical down from where its arms could be cut. Then make cuts according to other limbs you want on your monster.
After making the cuts, you need to sew the buttons for eyes. You can also past googly eyes with glue on him.
In the end, you need to stuff the monster. Start stuffing from ears, come towards face and continue moving down towards his tail and legs. Use a ladder stitch in order to sew it.