hello zäme, thanks for the answer. i am now ordering other pedals. will everything be included or do i need anything else?

Shimano PD-RS500

There are plate adapters from 3 to 2 holes, e.g. SHIMANO SPD plate adapter SM-SH41. But I don't know which one you need.

This does not work. For these pedals you need shoes with SPD (2-hole), i.e. such shoes https://www.galaxus.ch/de...

The Shimano SH-RC3 shoes are for SPD-SL (3-hole).