As always, kicking on your side, either with your arms by your sides or with 1 arm leading, is an excellent practice to gain good balance in your swimming. When doing this change sides after every breath but don't breath while you are moving from side to side. Keep your non-leading arm by your side at all times and make sure the arm is virtually completely out of the water, right down to your wrist. If it dips into the water you have probably lifted your head.
The main set is all done twice and is meant to be done at an even pace, at or above your triathlon race pace. Make sure you take your time when you touch the wall and adjust your effort if you're not keeping pace.