How do i change the original position of the players?

is that possible?

because it would be better, so i can get my team in order... instead of putting a QB at LB, and a OL at CB, you know.

Correct. Depending on how far off the "natural position" the new position is, it could take anywhere from a couple of games to SEVERAL weeks (I've heard as many as 40 games, which would be a minimum of 16 weeks or basically 1 full season).

I say stick with it, the long term plan is the best