Interperetation of art is fiendishly difficult, and in Dal's case, even more so because a lot of his art was a reflection of his own highly individual approach to the world, encompassing his own unique approaches to death, sex, dreasm, bodily functions, and so on.
Fortunately, there is a wealth of scholarly art types who write at length about the meanings in Dali's work - although the only man who could really tell you what they mean is the man himself, and he is dead, but even when alive, he delighted in winding up fellow artists and analystts with his impsih humour, often missed by those who took his every utterence as serious fact.
The best thing to do with Dali's art is as with any other art - look at it, marvel at the breadth of imagination and technical skill taken to create it, and take from it what you want. That is what I think Dali would want you to do - apart from giving him lots of your money that is!