You posted the Macbook Pro forum.
Read and follow the Bootcamp Installation instructions. You were offered the chance to read the documentation when you started Bootcamp Assistant. Then download and save the Windows Support software. Again, this is an option in Bootcamp Assistant. Then from within Windows install the downloaded Windows Support Software.
The process is straight forward if you read and follow the instructions.
And you might want to visit the Bootcamp forum where the Bootcamp gurus hang out.