Electrical Services niche biz in SoCal - Need GM help

I have a niche electrical services biz under LOI in Southern CA. High margin (60% ebitda), great growth opps. I don't have experience in trades, so I need to bring on that expertise. Currently run as a one-man operation, he does sales, proposals, and project management, subcontracting out all the labor. Minimal marketing spend with most sales coming inbound from referrals and google listing. Seller agreed to hold 10% equity keeping his license in the biz for minimum of 2 years unless I buy him out before then. I need a GM that understands the trades (preferably holds a general contractor or C10 electrical license) to take over the sales, proposals and project management. I will focus on marketing, building out systems and SOP's, and expanding services and territories for a much higher exit in 3 years. I don't know how or where to find a GM and would love some insights/pointers. I'm open to a partnership as well. SBA funding is available, but challenging until I come up with a reasonable solution.