if you can affoard it, 5x7 paper will make nicer images to view/hold than 4x5.
this to see how the ideal pinhole size will vary with focal length and 'neg' size.
the enlarger/timer (assuming it has a lens and working globe) would be handy for making the contact prints of your paper negatives.My friend said "I have an enlarger, filters and a couple of lenses. I have a timer (for the enlarger) and a 35mm developing tank. I have a couple of clips to hang film to dry and an easel." Would any of this be helpful in the project.