The first improvements which you should tackle are determined by their likely effectiveness and how quickly and cheaply they can be implemented.
Many aspects of improving inventory management improvement will be dealt with in this blog. Don’t just concentrate on a few. In order to produce large improvements cost-effectively, you need to improve as many aspects as you can.
A good starting point is often reduction of effective lead times. One reason is that most improvements in that regard do not require any programming. Another reason is that shortening effective lead times will reduce the impact of most types of inventory management problems.