new musical

I am at the beginning of writing my first musical. I have put down the first few songs on paper and sent them to the composer.

The basic story has also been set down. So now the hard part begins. I need to have realistic dialogue and story progress. It needs to be interesting enough to hold the attention of the audience. I have total confidence in the music and the songs. I also have total confidence in the plot and dialogue eventually.

As a noob though, I am nervous about how well it is all going to proceed. Is this going to take me years or months? Months.
I need to set aside time to work on this every week, if not every day.