Visual Basic 2005 Program Help

I have to make this program and I can’t figure out how. These are the requirements:
Create a speak application that allows the user to build a string by clicking buttons on the interface. When the string is complete, the user can then click Speak to hear the string as a spoken phrase.
I have to use 6 wav files called Cat, Dog, Fluffy, I, See, The, Is, Walk. They are in the My.Resources folder. I don’t know how to get it so the wav files will play when you press speak, instead of the word buttons.