It is usually best to shield yourself before you
2vs2 matches: In this bracket your team will consist of yourself and hopefully a damage dealer. The paladins supporting abilities are a bit overkill though since you only need Silkroad gold to focus on one person at a time.
If the enemy attacks your friend you need to keep him healed, but if the enemy attacks you then focus on yourself. In the meantime your friend will do as much damage dealing as he can and hopefully he will take down one player so you can gang up together on the second one.
3vs3 matches: This is a lot like 2vs2 matches, but you need to spread your attention to another teammate.
But if you are a good healer it should be no trouble. If all three of the enemy focus on one teammate with an assist train chain heal him with flash of light as quickly as possible, and if he is in danger of dieing try to shield him with Blessing of Protection.
If they spread themselves out to attack each of your teammates individually keep your heals on the ones who will die the fastest. This is mostly for light armor classes or classes being targeted by very high DPS enemies.
Sometimes all three people will come at you first to try and take you out. In this situation it is usually best to shield yourself before you are stunned and incapacitated. This will also give your allies time to attack one foe and hopefully take him down.
