Stellar has a fixed base fee. You can calculate the expected fee with this formula (# of operations × base fee) where base fee is 100 stroops  docs here

Nobody can earns xlm from his validator because all fees goes into the fee pool, then these lumens will be distribuited by inflation pools

inflation docs

Stellar use a different consensus protocol, SCP, the process that you're talking about is typical of POW consensus like e.g. Ethereum.

Lumens wasn't mined, they were emitted from the root keypair and periodically distributed

For more infos take a look at this page

Stellar has a fixed base fee. You can calculate the expected fee with this formula (# of operations × base fee) where base fee is 100 stroops. See the docs.

Nobody can earns XLM from his validator because all fees goes into the fee pool, and then these lumens are distributed by inflation pools.

inflation docs

Stellar use a different consensus protocol, SCP, the process that you're talking about is typical of POW consensus like e.g. Ethereum.

Lumens weren't mined, they were emitted from the root keypair and periodically distributed.

For more info take a look at this page