I don't know where to begin

A little history…I am wanting to design an athletic complex. Today, I was approached by someone that wants me to pitch the idea to the community Tuesday next week. The original idea was ju a t sketched out in paint. Now, the township/community want an actual design…I have no skills and no time to get someone else involved, is there a place that has basic shapes and templates that I can try to use? Or at least a tutorial site? I need something basic and plan on hiring a firm or individual to actual do this the right way.

learn.sketchup.com

You can try searching for pre-built components on the 3D Warehouse.