No-waste method of making starter from scratch
I really like Samartha's way of making a starter: no throwing out
The "usual" way of making a starter is throw out the half of previous one and then add flour and water.
Repeat several times and then you have your own active starter.
Just as mention here , you may toss out about 83% of flour to make a starter. Even though flour is cheap, you don't need to throw anything out and you can make a ~500g starter ready for making a sourdough bread by following Samartha's method .(step by step with photos)
This website also contains many useful information (with scientific spirit). I think it's good for the beginner. When your starter is ready, you can try to make a SF-style sourdough bread as shown .