Ask HN: What to study to learn optimization algorithms

I find my self needing to find ways to optimize production processes. For example given an order what is the best way to split up the order into given batches for production.

I'm thinking a SAT solver is going to be the best approach and using the multiple buckets problem. I don't have a lot of theoretical background in these areas and would like to read a book or two before starting down this path. Any recommendations as far as books or even subject matter to study?