This is a good time to take this real slow. Give a lot of thought to how to do this.
It is very difficult to get high end audio sound from an AVR / home theater. By combining functions both can be severely compromised. The best is to have them completely separated.
They can be combined using a pass through so your stereo speakers are connected to audio equipment to your speakers. You want separate audio preamp / amp of audio quality for stereo listening and then use the AVR for home theater and all the other speakers. I was able to separate my HT from my stereo system thirty years ago… so, I’ll let some of the folks here that have done it advise you. But a few things.
HT does not require the same high quality as stereo to be enjoyable (you are distracted by the video)… and as a consequence you are not going to get it.
Combining multi functions in one box significantly reduces sound quality. AVR is a real problem, but these days integrated amps can be really good. I was listening to a Luxman (509), Pass (INT-60), and Audio Research (I-50) this weekend. I can recommend any of them… but I am much fonder of the latter two because of the more natural musical presentation.
‘Anyway, think, research, think some more. There are so many ways to do this these days it can boggle the mind. It is really easy to do this simply and end up with a mediocre system.