That is the biggest problem with making sour dough bread.
A dozen components to chose from and thousands upon thousands sets of instruction and books.
If you buy a starter and don't get good instructions on how to feed and store it your screwed.
You only need a small handful of tools. If you don't have a kitchen scale to weigh things in grams you will end up trying to follow half ass instructions.
Not to say half ass instructions that measure things in coffe cups wont work but I think need a hands on mentor available for support.
Pictured is a cheap set of scales, a used pork skin container cleaned and used to store flour. A funnel with bottom cut out to help keep mason / ball jars (2 ea) and table cleaner.
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Standard Bowles etc. and not shown cheese cloth to use as a breathable lid, rubber band to mark height of starter in jars and a 5 qt Dutch oven .
I will give you 2 things that are like command level directives when making starter.
1.The flour can not be bleached or brominated.
2. Use filtered water or well water. Chlorine or whatever is in city water kills starters on about the 3rd day.
I was hard headed and tried my best to break both those "rules"