How do I know when to stop mixing my dough before kneading?

Step 1: Mix ingredients

Once all the ingredients are in the bowl, continue to mix until everything is one rough ball. There's no need to start kneading at this stage. 

Step 2: Rest the dough

Check that all the ingredients are in the dough ball and cover with a clean tea towel for 5-10 minutes to help the gluten start developing. After this time the dough will be easier to handle and you can start kneading the dough. Check out: How do I know when I should stop kneading my dough?