For Stake I should wait 30 days and be well? Or do I have to configure something else?
I saw a Japanese tutorial in which the guy downloaded a miner, do I have to do that?
Yes, for stake just wait for 30 days. You will get it based on the numbers of shnd in your wallet.
SHND is POS and POW. For POS you are fine. For POW mining you need to follow Japanese tutorial.
OK, I was a bit confused, now I understand.