you decide the sounding style: autotune synthetic used in RAP, POP ETC.
or a more natural sounding style, witch costs a bit more.
you should know that this is not magic, if you are way out of tune I can correct it but you will sound more digital, robotic, synthetic.
I will need for you to send me one track with your vocal and another track with the instrumentals they should be synced, the files should have equal length before exporting from your DAW.
I prefer if you send me a .wav or .aiff audio file.
Its better if you send me the key of the song, just to prevent misunderstandings.
For a more natural sound you should add the gig extras