I’m thinking about finding a language partner but unsure how useful they will be, how will I know if I’m ready to speak or not?
There´s only one way to find out. Everything else is speculations, perhaps very interesting speculations (I´m enough of a language-geek myself, to love reading about it) but still, just test it.
If you are looking for a partner, you are ready!
Thinking about speaking to someone,desiring to try etc… are probably the signs that you are up to!