Hi mate, there are plenty of royalty free sound databases on the internet...just google it and you'll find some.
EDIT: once you have a sound you like, you can edit it to make it last 1 second in your video/audio editing software of choice.
OK, as far as the video transition goes, you can take a still image as a background and then overlay some text on top. The text you could then move with the effects in the video editing software you use. This is just an idea for something simple.yes i know that but it is hard to me to find a song then make one 1 second video to go along with that video.
any tricks?? to make something cool?