Search engines are powerful research tools. Try creating a list of topics (see the bold terms on the sample project page) and see what you find in your favorite search engine.
Pay attention to new information to add to your search list and watch for primary sources available for your soldier's unit/regiment. Remember to open a WORD document and copy and paste your notes and URL into the file for future reference.
You might try some of the research links listed below.
National Park Service Comprehensive information about regiments and a search engine for company rosters.
Google for images! Click on the "images" tab and type in your words. You'll locate some great images to include in your project. Be sure and save the URL so you can credit your source.