Well, imho, if you want to be a "working drummer," you're gonna need a band to play with. I haven't seen any drummer soloists making money, myself.
As far as networking is concerned, you need to be where the music is, as often as possible. Pass out business cards, CD's, get #'s & names & referrals at every opportunity. Music stores, churches, festivals, open mics (even those w/out drums or electric guitars!), coffee shops & houses, local theaters, music studios, if you happen to hear ppl jamming down the street, go & talk to them! As I keep seeing on NBC - "the more you know." More ppl you know, more material you know, more venues you know - it all adds up to help you achieve your goals of getting together with others. Don't just talk to musicians, either. You'd be amazed at how many regular ppl know this guy or that who could lead you to getting where you want to be.
Your chances are much slimmer o/l, from what I've seen, than they are by being out there & being an active participant in the music world. Don't give this o/l stuff up, cuz it could pay up for you, but don't depend on it exclusvely, either.