ALWAYS give your creatures the best available weapons. I don't recommend giving your creature mixed kind of weapons - it's just hard to control your units. The best way is to create a homogeneous army - personally I recommend spears.
Just step out of it and kill your enemy. Don't let your enemy to destroy your village's main buliding.
Your main task is to destroy enemy village's main bluilding. To do so - first kill all of it's population.
Use your chief. He is stronger than others. He often becomes the main target for your enemy, but you don't have to worry about him - even when he dies the rest of your mates would still fight efficient.
After you destroy enemy's village don't forget to take his food to your village!