I have a noobish question, about the staking.
1) Is staking active from launch ? Or after the END of PoW ?
Staking is active since launch.
2) How to start staking ? do you have to encrypt the wallet then unlock it (stake only) ?
You need to hold your coins in the wallet at least for 72h. After 72h coins will start to generate interest. No you don't have to encrypt the wallet to stake. You need to encrypt your wallet just to protect unauthorized access and movements from your wallet.
3) Wallets that are not encrypted do not stake ?
Read above.
4) Wallet needs to be opened to be able to stake ? (closed wallet will not stake?).
No, wallets don't needs to be opened to start generating interest. Everytime you'll open your wallet and your chian is synced you will receive your maturated interest.
5) When the maturation process begins ? I got coins on my wallet from the begining, never send any off the wallet but no staking taking place (the sign on the bottom saying all the time: Staking your weight is... 29 minutes to reward (but nothing happens).
Read above. Btw what do you mean with "from the beginning"?
It would be great if devs could give some clear instruction about the subject.
If you need to ask more, we're here.
Hope we helped.