Make first or second conditional with the modal "should" in the main clause?

Hi. Which should be it? I learned that you can use the modal "should" in the main clause of a conditional sentence in both the first and second conditional sentence. (Sorry, this question just arose: Should I write the underlned part "the first and second conditinal sentences" with the word "sentences" in plural)?

If you have (had) money, you should spend it.