I was very active in this community many years ago
Feel free to share, did you have an account here before?
3.) I have lots of very old (2013) private keys generated on paper wallets from bitaddress.org with bitcoin on them. How do I go about importing them?
My advice: only import them when you're planning to use/move the coins. Depending on the value you sould consider this:
I was considering Electrum, only downside is that when creating a wallet, seed creation is exposed
Online:Install Electrum on your PC.
Import your address to create a watch-only wallet.
Preview the transaction, Copy the unsigned transaction. Put it on a USB stick.
Offline and running without hard drive storage:Get a Linux LIVE DVD. Use Knoppix for instance, or any other distribution that comes with Electrum pre-installed.
Unplug your internet cable. Close the curtains. Reboot your computer and start up from that DVD. Don't enter any wireless connection password. Keep it offline.
Start Electrum. Import your private key.
Copy your unsigned transaction from the USB stick, load it into Electrum.
CHECK the transaction in Electrum. Check the fees, check the amount, check all destination addresses (
character by character).
If all is okay, sign the transaction. Copy it back to your USB stick.
Turn off the computer. That wipes the Live LINUX from memory and all traces are gone.
Online:Use your normal online Electrum to (check again and) broadcast the transaction.
Bonus:After moving all your Bitcoin, and once the transaction confirmed, check if you own
Forkcoins.
As for wallets: I use many: Bitcoin Core, Electrum, Mycelium, BlueWallet, Phoenix Wallet, hardware wallet, paper wallet, Coinomi and probably a few more I forgot now. It depends on personal preference, and on the value you want to store. It doesn't hurt to try a few.