When I applied, I included the following:
1. My education background (major, GPA, graduation date)
2. My skills (e.g. computer, bioassay, whatever lab technique you know)
3. Your previous lab experience / publication / poster / conferences
4. References (I think they're useful, as I would call them for my lab's new hires)
5. Any other experiences you want to include (some PIs only want research-related experience, but some like to see what else you have been doing too)
It's okay to have an empty resume when you just first started college. When you graduate, you will have that resume filled with achievements!