Well I think I might want to play rugby this year. I'm 14, 5'7, 140lb, fit, fast. What position should I play, what are the practices like? This will be my first year.

Well, I'm 14 , 6'2 and 180 lbs so expect to be tackling bigger guys. Depends on how strong you are, but if you're fast I'd say wing or scrumhalf. Bit small for center. The practices depend on the team, so you'll have to see for yourself, although my team do a lot of sprints, push ups, etc

need more weight like 300 pounds