Statistically, scoring in counterattacks is easier than in other game situations. This is because, while not necessarily outnumbered, the defending team may be caught out of shape. So, the first few seconds after losing a ball are critical for any team. This attack to defence transition drill will help your players stop counterattacks after losing the ball.
Set-pieces are hard to execute when you play an amateur league and have very little time to train. But, you must have a couple of simple plays under your sleeve to take advantage of free kicks and corner kicks. This post describes a simple attacking corner kick set-piece that works well at amateur and professional level.