how do I get music from my PC to my ipad, now that itunes has gone

iTunes for PC is very much still alive and kicking!

You can download iTunes for Windows 7 directly from Apple; for Windows 10, you can download iTunes from the Microsoft Store.

Download and use iTunes for Windows – Apple Support

For Mac only, iTunes has been replaced by Finder.

If you are having difficulties with your iPad being recognised by your PC when connected, this support page may be helpful with troubleshooting:

If your computer doesn't recognize your iPhone, iPad, or iPod - Apple Support