Your stake has a warming up and a cooling down period. Once you’ve delegated your stake it usually becomes active from the start of the next Epoch (an Epoch in Solana lasts 2-3 days). You will earn rewards once your stake is active.
The rewards are added to your stake account at the end of the epoch. This happens fully automatically by the Solana blockchain. Validators cannot steal or change the rewards you’re entitled to.
All stakers will get VAL tokens when staking on a Valhall Validator. The extra bonus reward is 15000 VAL shared pr epoch on Solana.
(There is a max limit of 1000 VAL pr strake address pr epoch. There is also an exeption for large known pools and stakes below 2 SOL, these will not get the VAL reward bonus.)