how do miners get paid? where does the money(rewards) come from?

Let's say Tom sends Bob $50,000 via bitcoin. let's say you are the only miner in the world. you have a lot of GPU you've completed mining this transaction. All I know is mining means you are verifying the transactions and in return, you get a reward. in this case, where does the reward come from? So Tom's wallets now have 0$ but Bob's wallet will have $50,000. But you're a miner and you somehow get a reward $. let's just say $100. where do these rewards come from? what am I missing here ? How does this work ? Does Tom have to send 100$ extra fee on top of 50k ? or does BOB who's a receiver has to pay $100 for whoever that's going to verify this transaction(miners)?