I'm fairly new to Taxi and the publishing game but I'm not new to composition and songwriting. I'm realizing while reading through some of the forum posts that libraries are a logical and possibly necessary step in going from making music to placing music. I've seen several posts talking about this. Can anyone please give me some insight on what to google, or where to look to find a real resource with good contact info for music supervisors and libraries (preferably libraries, as from my reading I've come to understand it's a good starting place. Please correct me if I'm wrong

I understand that contacting them and submitting through their preferred method and following up 3 to 4 weeks later is the commonly accepted time frames. I do have a couple of questions:
1) How many tracks should I be showcasing within my demo?
2)I compose across several genres. Should my demo stay to one genre or should I showcase my talents across genres?
Also, any other useful information, pointers, complaints, success stories that you have would be much appreciated.
Thanks for listenin

-T