I went from Div IV to Div II in 2 seasons, training my now U21 PF and another 2 trainees which I purchased next to him. It's possible, and quite doable.
Miss, I'd suggest a balanced offense like Push the Ball, should give you a solid indication of where your strengths lie after a few games. PTB also looks for the best shot, whether it be inside or outside, so you won't be too reliant and become a one trick pony. Best defense against a Base Offense depends on the opponent, sometimes it's 3-2, other times Man to Man. If you have a PG and SG with 6/7 OD, play M2M. It should cover your opponent's shooters.
In regards to training, send me a BB-Mail.