In Austria new teams frequently start in Div II because a lot of teams go bot here. I suggest to put new users in the lowest availiable Division.
Starting in a Div II teams get crushed every game and many users quit soon... I think that if those teams would start in a bot league they would perform much better (easy promotion from IV to III and then II) and build their team at the same time - this would be much more motivating.
This would give teams in my country at least two seasons to assemble a roster and learn about the game mechanics, without having negative emotions everytime they get destroyed in a league or cup game.