For example, I need some object/unit generator, but I don't know how it's called in Pd. How can I find this object?

Ask the list, or this forum !

They are all listed here: http://protman.com/content/list-puredata-objects-and-extended-objects

@alistair_blunt said:

They are all listed here: http://protman.com/content/list-puredata-objects-and-extended-objects

Thank you.