Welcome!
I think the most important question getting into PCPs is what is your budget? If you’re looking for something inexpensive and quiet the Unarex Notos is a fun choice. Lots of custom parts and mods available. Comes with an integral suppressor and is pretty darn quiet. Has been known to be pretty accurate but is definitely “entry level” in some aspects. It’s not the most powerful, but is widely loved and can be found for around $250. Along with any rifle you get you will need a way to fill it with air. I’d suggest a decent compressor which will also set you back about $200 or so depending on model and specs. So for under $500 you can get into a Notos with compressor and have a fun “suppressed” rifle. It all goes uphill from there!!!
What is your budget and what will you be using it for?