There are lots of resources you can discover about making a pinhole camera.
This LINK is just one concept, and has full instructions, including the page diagram
to print out, so you have the 'working drawing' to simply play cut and paste !
Then, buy the cheapest roll of 35mm film from your local one-hour processor,
and you have all you need !!! Making the camera is half the fun !! Good luck.

PS. Another handy and interesting LINK

**Check below for events in YOUR country.**
www.pinholeday.org