I don't throw any away, just keep adding flour until the jar is full. My measurements for bread are about 550g flour, 1tsp salt, 300g starter, 200g (I just weigh it, easier and allows me to rinse the bowl of the scales) of water.
Stir, knead for a few mins but it doesn't really require kneading like a traditional loaf, leave for 24hrs in a large bowl or proving basket. Turn out onto baking tin. You'll get some flatter ones, some beautiful round ones, some absolute pancakes, they'll all taste great.
Bake on 200 fan for about 45 mins but check at about 30. I put a tin of water in the bottom of the oven, apparently the steam helps the crust develop.
I find it does make a positive difference to use organic flour or part spelt or rye but it's definitely not essential. I've made plenty with Aldi bread flour. You can also add seeds.
Add more flour to the jar to keep the starter going.
I take a casual approach. Some websites are quite daunting.
Odds and ends of bread make a good casserole topping or panzanella. Even any failures can be used to great effect this way.
Enjoy!!