If you don’t understand how staking works, you should not be staking…

I believe you can, for a small fee, unstake immediately through unstake.it. I have not used it personally but the sol validators trust it. Or you can just wait for the end of epoch.

The current Epoch will end soon, so you should get your SOL with the beginning of the next Epoch. To know when an Epoch starts and ends, check Solana explorers: https://solanabeach.io https://solscan.io https://solana.fm

You can track current epoch progress here https://explorer.solana.com, but remember it is only approximately values

In the next epoch I guess. Epochs changing approximately 2-3 days