So yah to my understanding build a breeder start trading and hope to get lucky.

is this the basic method and is there more to it than this or a better way?

btw i play sv vanilla so cant use cheats or anything like that thanks.

That's it basically.
Kill the bad ones, keep the good.
Pray for rng to be in your favor.

You can also convert villager zombies with a splash weakness potion and golden apple.
So that will let you basically CHOOSE what type of villager you want.