You are now on 'the journey.'
I have given you a few websites to look at
#1 The King of Piano Information - esp buying a used piano LARRY FINE's web site:https://www.pianobuyer.com/
#2 Pianomart - used pianos for sale - you can put in what you are looking for.
but beware- hire a technician before purchasing a piano, esp from a private owner.
Some advice - i purchased a beautifully rebuilt Steinway Model A (1912) - it was rebuilt in 1996 and reburbished in 2021
Steinway dealers mostly want to sell NEW Steinway's if they surmise you can't afford that, they will convince you to buy a new
Boston or Essex (Steinway's made in the Asian Market- some good/some not so good)
Here is a list of highly reputable dealers in the US that I have dealt with personally:Freeburg Pianos
(Levi Freeburg) Hendersonville NC (where I purchased my Steinway)Cunningham Piano Co
(Rich Galassini) Philadelphia PA (he is the best/knowledgeable/pleasant person ever)Pianoworks
(Sam Bennett) - Atlanta, GA (you can see examples of his rebuilds on YouTubeFaust-Harrison
(Irving Faust) - NYC area - top Steinway rebuilderLiving Pianos
(Robert Estrin) - watch his videos.
Stilwell Pianos in Arizona
Ric Kassman in Berkley CA
Hollywood Pianos in LA
these are not the only dealers but a good start and LeviF & RichG are especially great and will help and guide you and be more concerned about you finding the right piano.
Good Luck - keep us posted
and let us know how you make out
OH - and TAKE YOUR TIME - play as many pianos as possible