I working on 7 songs but one is coming out as a single and I want you mix it

The song that I want you to mix first hiphop and a traditional Ethiopian drum pattern. I have 25-30 stem files. The release date that we planned is Jan 20. The arrangement is good but I haven’t started any mix on that. I also want to know how much you charge for 1 song to do the full mix? Thanks

Additional info:
I'm interested in working with a very experienced mixer. The tracks are cleaned, tuned, and and the song is ready to be mixed. . I'm going to hire a different mastering engineer. I don't have a hard deadline for this. The song has somewhere between 10 and 30 tracks recorded that need mixing.