Welcome!
Speakers are most important but must fit your tastes and room. Shouldn't have to be that way, but that's reality.
Room is the place to start. Avoid small squarish uninsulated rooms. Hopefully it's dedicated to you and listening.
Power amps simply serve the speakers, so match power first. Understanding wattage versus dB's of gain is vital in the power ?.
Next, pick your source(s). Streaming is popular and once setup supremely convenient and empowering. Vinyl is at the opposite end of the spectrum, very hands on, hobby oriented.
