For my first self made flash light i used:
piece of wood
two LED light
and two AA batteries
with the wood we made a battery holder to fit the 2 batteries and have a power source of almost 3V. we used some copper paper at the ends and connect wire to it.
after connecting all the elements, we build a case with the cardboard.
Here are some pics of the project.:
Looks good. In the future you may want to use a AA battery connector: