Question
The goal is to have a document that I can present to potential sponsors, partners, etc, so that I can weather or not they have interest in the initiative.
Answer
Try an infographic but if budget/skillset doesn't allow use a word doc and create a pdf. Whatever you do keep it short and sweet and a better suggestion is to use the body of an email for the actual pitch and the attachment/one pager or close too with supplemental info. No one likes reading and this is just an opener so they get a feel - you can answer detailed questions in a call/meeting