At least you have experience in working with asset management company and I hope you know how they worked to create relationship with the main lenders to get work from them. Once you get the orders from the lenders, then its easy to find realtors who can assist you in selling those assets. You can count me in as your realtor for California. I can send my information to be added as your real estate agent for California areas in my market areas.
I guess, you need to sit with an attorney and CPA to create the company, register, open bank account and other required documents..and hire your team for marketing & calling lenders to build relationship... Good luck!!