If you mean what things "start" as in "activate" or "work", the list might include:
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Some nouns for things that start with the letter A are:acornanchorankleappleargumentazaleaSome nouns for places that start with the letter A are: AfricaAnnapolisArabian DesertArizonaArctic CircleAustralia
ballbathtubbeachbanana
Many things is more than two, more than a few, and more than some. But it is less than endless or infinite things. So many things is the amount that means "many" to you.
It is because many things are measured with reference to a fixed point: it space or time. This point is called a reference point or origin.
simple count how many there are too start with add them together then simply divide by how many there was to start with