one thing to think about is model release forms.
when i take portraits of people that i expect to use
on my website or on the web, or in a portfolio
i tell the people before i take the photographs
( i should use the form but i don't )
and i give copies of the photographs as "compensation "
(some folks use $1 but i like to give a print ) and
make sure that in the days, weeks, months and years down
the road they don't mind me using their portraits for my own purposes.
suzanne is right about the copyright, you should retain it
( unless they want to pay you a fortune for a full buy-out ).
give first prints for free, and if they want to reproduce them
or use them in any way they can as long as you get a "by-line".
your project sounds like fun
john