For the head pin try and use brass head pins (iron is fine but it is not as soft as brass to work with). Also if you can try and source findings which are nickel & lead free. A lot of people are allergic to nickel and lead is dangerous is swallowed (more for young children)
CREATING THE WRAP LOOP
1. Take one of your head pin and thread the bead on it. Place the tip of your round nose pliers on top of the bead (picture 2). Now bend your head pin at a 90 degree angle (picture 3).
2. Now take your round-nose pliers and place it on the top of the angle (not a the tip this time, a little bit inwards to give your loop a nice size) and starting wrapping the wire around the nose of the pliers (picture 4) This would have created half the loop.
3. To create the other half of the loop change the position of the pliers (picture 5). Once you are happy with the shape of the loop (picture 6) then you thread the bottom loop of the setting (picture 7).
4. Now take the tip of your round-nose pliers and hold the loop together (picture 8). Take your flat-nose pliers and take the end of the wire and start wrapping it around the wire on the bottom of the loop. Starting at the top working to the bottom. Once you have reached the bottom trim the wire and finish neat.
FINISHING THE EARRING
5. Take the cabochon and glue it to the setting. I used E6000 but any jewellery or craft glue would work.
7. Take the ear hook and using the round nose-pier gently undo the loop on the bottom. Thread the top of your setting. Once attached gently close the loop.