Now back on your Windows computer, you will see an Electrum-RVN icon on your deskop. Open the program up and go through the initial setup steps. When you get to the part where you can "Choose a hardware wallet" pick that option and go from there. If it can't see the Ledger, make sure you have your Ravencoin app running on it. You can accept the defaults for everything else, once it sees the Ledger.
Your coins are safe on your Ledger. You can always recover them from another Electrum instance or any other BIP39 wallet by simply using the seed words from your Ledger.