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.