Welcome!
So here's some advice:
1.) Find a proper listening room (not squarish or small, hopefully well insulated and dedicated to listening).
2.) Educate yourself in terms of music appreciation (live/unamplified) and audio characteristics.
3.) Properly shop for loudspeakers (no distractions, limited to 4 per day, use music you're familiar with, and take notes).
4.) Then shop for the rest (power amps simply serve the loudspeakers, hopefully you'll be able to have multiple well place subwoofers to address internet in-room bass peaks/dips).
