Questions about Sparrow Wallet

Hello everyone!

I'm diving myself into learning more about Sparrow wallet and I have a 2 quick questions for you:

1. I created a 2-2 multisig wallet, creating 2 software wallets directly in Sparrow neither with passphrase nor password. Just to test how multisig wallets work. I haven't transferred BTC to this new multisig wallet since transfer fees atm are a bit expensive.
2. Let's imagine I have, and now I want to send my BTC to another wallet. How do you sign transactions with a SW wallet in Sparrow? I watched a BTC Sessions tutorial but Ben used 3 HW wallets and no SW wallets. What do you need to input? A private key from each wallet? How do you get them from Sparrow?
3. Is there a quick tutorial on how to use Bitcoin's testnet in Sparrow? How do you get the coins?

Thanks in advance! If I'm not being clear enough, please let me know.