I have been writing, mixing and mastering music for years, for myself and for others. I have helped musicians bring their ideas to life and get them streaming on Spotify. The next person I help should be you!
Please make sure you can provide your project stems in WAV format. For example, if your song has drums, guitars, and vocals, I will want three different WAV files; one for each track.
When an artist wants a proper mix/master for their project, the first thing I ask for is the stems or raw recordings. I will take the rest from there, and typically add and subtract as I see fit. After the initial mix and master, I discuss with the artist what their thoughts are, and work on a revision if needed.