Here are some links you can use as a resource: 
  1. http://www.slideshare.net/hierospace/hinduism-5776875
   2. https://docs.google.com/viewer?a=v&q=cache:vDC59Xk1Te4J:www.miltonkeynes.gov.uk/emass/documents/Hinduism_Presentation_(with_names).pdf+hinduism+presentation&hl=en&gl=us&pid=bl&srcid=ADGEESj704zFLpajoOMMA0GHlMiz8M02-0n3SgpyNT40tw5IL_98Hdaq0hNTl5DC9B-Snv2u_ba1dSpWuDV-Hc3y66Bcxtf5ksydfKBrkLdm21z7X3rTgECy6epPymVZJkEwRS2N3dmE&sig=AHIEtbR6AZMMDzYKzCI_5AstzB2D-Gy0Tg


You are giving a presentation to highschool students so make sure you don't have too much info on the same slide. You gotta be funny if you want them to follow you so you can use kamasutra,yoga in the middle of presentation. Good luck dude and keep in mind, you are the ambassador of us and our culture!!  Make us proud!!