A pair of Paradigm PW600 active speakers have everything you need to get started. They are powered speakers so you don’t need an amp. They have an app so you can stream from many services as soon as you set them up. You can add a CD player or a turntable using the RCA inputs on the back. You can connect a sub if you ant. They have ARC room correction to help them perform better and adapt to your room. PLUS they are 50% off right now, (check the review):
Configured as a stereo pair, the PW 600s sounded outstanding, easily rivaling separate speakers and electronics costing many times their $1198/pair price.