Your starter should be active and vigorous. Feed it the morning of the day before you want to bake. It should almost double in size by the time you mix it into the dough around 6-8 hours after feeding
Late afternoon (6-8 hours after feeding starter) mix together the flour and water and allow to autolyse for 30 min. Then add starter followed by the salt.
Mix well, scrape down bowl and rest for 30 minutes.
Stretch and Fold the dough, then rest for 45min - 1 hour.
Stretch and fold 3 more times. Followed by a 30 minute rest.
Preshape the dough then rest another 15 minutes.
Load into floured bannetons (I use rice flour to prevent sticking), with the seam side up (ie the top of your loaf is at the bottom of the banneton to pick up that nice rattan shape).
Allow to rest for 15 minutes then refrigerate overnight.
1 hour before baking get your oven preheating to 250c. It needs a full hour to heat the baking stones and dutch oven properly.
Bake time, transfer out dough to parchment paper. Score with a bakers lahm, then load via some parchment paper into the screaming hot preheated dutch oven. Spritz well with water then quickly cover to trap the steam and return to oven.
Bake for 20 minutes with lid on. Remove lid and bake another 15-20 minutes until desired level of scorch is reached.
Remove from oven and allow to cool FULLY on a wire rack. Don't be tempted to slice into your newly baked loaf of bread till it's cool. It's still cooking while it's cooling down and your patience will be rewarded if you wait.