a general rule is : defend where the other team attacks (if he uses mainly run and gun use 1-3-1, if he uses motion use 3-2, look inside 2-3) and attack where you strengths are ( inside, outside, 3 points or 2 points), try to surprise your opponents...
there is no set tactics that will help you as a new team, you have to figure out what your strengths are and compensate for your weaknesses... that's why this is a "strategy" game... try to surprise your opponent and read his next move...