(me again!)... you could see if there are any jobs around the school you could get students involved in like a bit of paining or recycling to promote pride in your school.
if you are into helping the community- how about a volunteer service to help the elderly. you could set up to help with jobs like gardening or encourage pupils to write stories & letters to distribute to pensioners on their own as they can get very lonely (not sure how the school would view visiting them though due to safety & security)
anyway- you've obviously got ambition & confidence to want to do this, so be yourself, give it 100% & show you can lead by example. i'm sure you will be great!
best of luck X