If it is modeling, this version of mathematical modeling written by Xie Jinxing is very good and very easy to understand. Generally this textbook is the first one.

In addition, we can see differential equation modeling.

Software, you can learn matlab to actually handle 300 cases of argot. If you watch the online tutorial, it's ok. Only about 40 pages. Spss can borrow books. You can learn to sell now, but you must figure out the mathematical meaning of the operation in advance.