Design hardware for hearing aids, minus all the speaker components. I would like a list of all necessary components, the code needed and how to build these all together. (PCB design, electrical engineering/hardware and coding knowledge are needed)

Design hardware for hearing aids, minus all the speaker components. The design will need to include a microphone, all audio conversion or amplifying components, but I already have the speakers with a + and - wire. The speakers are "8 Ohms Exciter Speaker 1W 300Hz ~ 19kHz Rectangular 90.1dB" and I already have them, but I would like a list of all necessary components, the code needed and how to build these all together. (PCB design skills, electrical engineering/hardware knowledge and coding knowledge are all needed). Preferably will show me how to assemble all the parts and code them all.