1) Have u guys played SC1/BW before?
Knew it's existence but that's it., never touched it

2) When did u guys started to play SC2? Since the Beta release?
around february 2011...

3) How many hours you play SC2 per day averagely?
Hardcore playing from february untill may, University Life taken over... 3 hours of sc2 over the week end..

4)Laddering practice is very significant when u're in bronze and silver... i got through them in around 2 weeks... Alot of cheese during these time.. Bear with it.. and after u finish with it u'll be amazed with how easy it actually is to be prepare for cheesing with proper scouting and proper building placement.. =D