How do you play Broodmother effectively?

I am a moderately experienced player but for the life of me I can't figure out how to play Broodmother effectively.

Everything is usually fine until they drop sentry wards in laning phase and then I have no idea what to do. I usually just sit back and gain experience and use my q to last hit when i can since I am usually in the hard lane 1v2. But this means I can never push down the teir one until its mid game.

At midgame I can usually push down teir 1 tower but I have trouble after that pushing down teir 2. Also in team fights I have no idea what the role of brood mother is. If i am suppose to take down the carries or attack the supports or attack the semi carry. I usually go for support but what ends up happening is they can kite me for around 4-5 seconds causing me to chase them away from teamfight where our team usually loses a 4v4.

Item build is usually treads, soul ring, bkb into whatever I need next(butterfly for damage, vlad for melee based team/pushing power, a.c./vanguard/hood for more tanking).

Hopefully you guys can help me win my first game as broodmother :D