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1. Organize Your Audio Files: Proper organization of your audio files can save time and confusion later in the mixing process.
2. Clean/Trim Audio: Clean up any unwanted noise or trim excess audio at the beginning or end of your tracks.
3. Correct File Format: Most mix engineers prefer WAV or AIFF files because they are uncompressed and provide better quality.
4. Labeling: Clearly label all your tracks. This helps the mix engineer understand each track and where it fits into the song.
5. Avoid Over-Processing: Avoid processing your tracks too much before sending them off for mixing. Let the mix engineer add effects as needed.

Check out A Guide To Sending Your Music Tracks For Mixing for comprehensive information on preparing your music tracks for professional mixing.

Here are some key formatting essentials for songwriters:

1. Label each song section in bold font: Verses, choruses, and bridges. Clear labeling makes your song easier to read and understand.
2. Keep it simple: The format of your lyric sheets should be clean and basic. The title should be at the top of the page, followed by the lyrics.
3. Learn common song structures: A typical song structure includes an intro, verse, chorus, and bridge arranged in a specific order. 

Check out Formatting Essentials For Songwriters: The Key To Professional-Looking Lyrics to discover the formatting essentials you need to know.