My earlier Dada reference got me to searching for the manifesto, that is to say the one with which I'm familiar. There were a few, as well as assorted ramblings. Try this excerpt from Tristan Tzara, translated by Robert Motherwell in his Dada Painters and Poets:
..Every product of disgust capable of becoming a negation of the family is Dada; a protest with the fists of its whole being engaged in destructive action: Dada; knowledge of all the means rejected up until now by the shamefaced sex of comfortable compromise and good manners: Dada; abolition of logic, which is the dance of those impotent to create: Dada; of every social hierarchy and equation set up for the sake of values by our valets: Dada; every object, all objects, sentiments, obscurities, apparitions and the precise clash of parallel lines are weapons for the fight: Dada; abolition of memory: Dada; abolition of archaeology: Dada; abolition of prophets: Dada; abolition of the future: Dada; absolute and unquestionable faith in every god that is the immediate product of spontaneity: Dada; elegant and unprejudiced leap from a harmony to the other sphere; trajectory of a word tossed like a screeching phonograph record; to respect all individuals in their folly of the moment: whether it be serious, fearful, timid, ardent, vigorous, determined, enthusiastic; to divest one's church of every useless cumbersome accessory; to spit out disagreeable or amorous ideas like a luminous waterfall, or coddle them -with the extreme satisfaction that it doesn't matter in the least-with the same intensity in the thicket of one's soul-pure of insects for blood well-born, and gilded with bodies of archangels. Freedom: Dada Dada Dada, a roaring of tense colors, and interlacing of opposites and of all contradictions, grotesques, inconsistencies: LIFE
Read more here.
If you're like me, basically untutored in art, I'd suggest you go to your local library and check out the old PBS series, The Shock of the New. Great stuff.