First, you need to find out if your computer has Bluetooth capability.
You can find this out by going to Control panel, Under hardware and sound click add a device.
Its crucial that your phone has your Bluetooth on while doing this. It will start scanning for your phone
If your phone is on the list double click it and it will start connecting it to your computer,
after it has completed go to my computer and your phone should be on there, you can then move music on to your phone.
If your computer hasn't got Bluetooth installed you can buy external ones from hardware stores.
Hope this helps!