Can someone explain the double object pronoun rules, when to use them and how?

If you have both of the direct object pronoun and an indirect object pronoun , and it is in the same sentence, the indirect object pronoun will come  first.
When both of them begin with the letter "L" change the first pronoun letter to "s"...
e.g. Le la= Se La ; les los= se los (and this is to avoid the tongue twister effect)

in a negative sentence, the negative comes before the first pronoun (e.g. no se la)

If sentences have two verbs, you have two options, depending on the pronoun.
place immediately before the conjugated verb and then attach the infinitive.