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