SMB is arguably the most well-respected trading firm around. I don’t believe they offer a service as Brendon has described. You have to be accepted and hired (whether intern or desk trader) by SMB. You can’t just sign up and start trading. They train their interns through a full training program and ultimately you trade with their money, assuming you are given the opportunity.
One of the founders of SMB Capital is the author of One Good Trade and The Playbook. There is also a video in the BBT YouTube channel that has an interview with said founder, Mike Bellafiore. Great interview worth watching.
There are firms out there that will give you a funded account after you pay them x amount. I wouldn’t touch any of those firms.