Hmm... Where to start...A variety of lasers in a variety of powers and wavelengths will burn flash paper. Black paper or a black dot on the paper will make it much easier. The lighter the paper, the more powerful your laser will need to be. Full disclosure: I knew nothing about burning flash paper with lasers until I typed it into the LPF search bar 40 seconds ago
You can buy a laser pretty easily that will work, or get a quality laser from a member with a good rep on the forum. As far as a sound effect, I am currently offering high quality mp3s of me going "sha SHA" for only 4.99 through PayPal. :anyone:?
I'm just messing with you, but in my experience you will get much better response if you introduce yourself in the welcome thread and put your location in your profile so people can give you more targeted info.
Later!
P.S. I would classify myself as one of the least knowledgeable people on the forum, so I really do hope someone else replies. Good luck!