The first thing to do is to write down what you would like to happen during the battle (what kinds of attacks you would like to perform). You should also be thinking about what kinds of buffs and debuffs you should be worried about during the battle.
Once you have set down the commands start a fight. It won't work very well because you have not specified any logic. The next step is to see which attacks are working and which aren't working and lay down some logic. Instead of giving you general guidelines (which can be found in the Language Reference) there will be a specific example. Suppose you have Bloodthirst and Execute in your attack sequences without any logic and suppose you have enough rage to use either one and they are both ready to fire. If Execute comes before Bloodthirst in your attack sequences then it will fire, but if Bloodthirst comes first then Execute won't fire. {to be continued}