Predictive Stock Level Optimization

I have a full extract of our retail inventory history and I want to turn it into a living model that tells me exactly when, what, and how much to reorder so we stop tying up cash in slow-moving items while never running out of the fast movers... (Budget: €12 - €18 EUR, Jobs: Data Analysis, Data Science, Machine Learning (ML), Predictive Analytics, Python, R Programming Language, Statistical Modeling, Time Series Analysis)