StructuralEIT:
"Cold Calling" is just going thru the local phone book, or any other source, and calling up the firm or person, whom you have never met or spoken with previously, and speaking to them regarcing youself and the services you can provide.
Corrrespondingly, a "warm call" is someone you have previously met or spoken to, someone with whom you have already established a relationship, be what it may.
I started this way too, to increase the potential of getting my name out there - I had a success rate at the time of 1 job per 5 calls, which is quite good from what I hear. Even though a poteential client may not be interested at the time, he may run into someone whom you have not contacted and pass your name on. You may get a call out of the blue from someone you have never contacted, It's called developing a network.
However, you will have a problem in today's economy getting started as the jobs are few in many areas now, and the competition for the jobs that there are is great. I started out in 1986, after the Reagan cutback and during the recovery. Much better prospect for success.
Good hunting.
Mike McCann
MMC Engineering