Good luck. Step one of that process is to make it to some level of the volunteer circles. The only one of those that isn't invitation only(to the point that asking tends to automatically disqualify you forever) is the Demo Agents.
Step two is to wait until they ask for design submissions, usually geared towards a specific upcoming product. There are no blind submissions, and it has been at least a few years since the last call for designs, and if you've heard of any new Reaving-era products coming up, you know more than me.