This is a letter which you could give out to potential project people (ie Anglicare, local council, businesses, schools) where they could nominate a project for you to do.

I would firstly start with a phone call where I would briefly explain the nature of the event (ie. Youth inspired to serve and bless their local community) and ask if they would like to think about a way that X number of young people could assist them.  Let them know you will be sending them a letter with some project considerations to think about.

Here is that letter. letter to project

Here are a couple of Admin resources which might be helpful.

This is a registration and indemnity form for participants (word) - form_rego2010_main_participant

This is a registration and indemnity form for leaders (word) – form_rego2010_main_leader