You won't get any commercial work running ads. Commercial requires getting to know GC's and slowly building relationhips with them doing one small job at a time, then larger jobs, etc.
Cold calling GC's might get you the opportunity to bid a job, but you are just a number and they will still give the job to the guy they have confidence and a relation with.
I have friends that have really large successful EC businesses, they all started out working as electricians, then went into the office, learned estimating, project mgmt, etc. That's where they build relationships. Working with GC estimators and PM's.
At some point they all went into business for themselves, and had relations established, jobs to bid, and contracts galore almost immediately.
I doubt that is the route you are taking right now, so you will have to do it the hard way. Find one GC and start bidding and maybe he will throw you a bone. Then perform well and work toward the next one. Then that will open other doors with other GC's the more work you successfully perform. Better yet, a relative in the biz.
Good luck