A lot of beats for mix and master and an álbum in process

I have a lot of beats, tracks etc... I want to release them but of course they sound not good. For other side i am working in a rap álbum with between 7 and 9 tracks. As well i need mix and master, So looking for someone to mix and master a lot of tracks How that work? How much per song? How much the album? Thanks amigo

Additional info:
Check out the song I attached. I don't have a hard deadline for this. I need the mixer to do some editing, time aligning and vocal tuning before mixing. I'll need you to master it too if possible. The song has less than 10 tracks recorded that need mixing. I'm interested in working with a very experienced mixer. I'm an indie artist.