Okay, I registered with your casino

Now where can I get my free sign-up bonus? Well, kidding aside, could you explain in greater detail how we bet without our funds being sent to the casino? As I understand it, we bet using EOS coins on the EOS blockchain in a decentralized manner, right? So if I want to make a bet, I have to install an EOS desktop wallet (given that you don't have control over my funds). This part I kinda understand, but what's next?