You could see if it's still possible to do a free audit of this Berklee "Arranging for Songwriters" course. Look for the word "audit" if you decide to click through the menus.
Here's what the last lesson #4 is about ..
>Instrumentation and Vocals - In this final lesson we will look at how to build the rest of the track around your song. Now that we have the foundation of the groove with the drums and bass, we'll take a look at how we can add other instruments to the mix. Most importantly, we will discuss how to incorporate these additions without taking focus away from the vocal part. By the end of this lesson, you will have completed a full demo of your original song.
https://www.coursera.org/learn/arranging-for-songwriters
That web page lists the other lessons in the course. Once you have a demo, a band could probably play it and you could sing it.