All you need to do is choose between a sword and an axe. If you really want to spam click, you should use a sword as it has a faster cool-down. What most people do is change their attack indicator to their crosshair to see the cool-down. A small meter will appear on you crosshair and when that meter is recharged again, you should be able to hit. You can leave it default on hotbar as well though. Beware, an axe does more damage but a sword will do even more overtime. Fights are much longer and spam clicking only works with a pickaxe and is usually used to break armour. Hope I could help you. If you still have questions, feel free to start a conversation with me ;).