I am planning a fundraiser for this .Our schools youth summer league really needs this improvement .I just need a little help getting started.

A dugout is typically built as part of the fence area. It can be as simple as a separate piece of fence 6 feet apart from the field fence and can be covered with plywood or not covered.

Hit up a fence company and see if they have any job leftovers to donate in exchange for putting their name on the fencing. You only need a frame and maybe 15 to 20 feet of 8 to 10 foot high fencing.

Here are some benches:
http://apark.com/subpage.asp?category_id...
http://www.theparkcatalog.com/items.asp?...

You may also want to call your local city parks dept purchasing dept, they may have a vendor they work with that will give you a good deal. Also, check into a bat rack. You can sometimes get a welding shop to make one for free for a little advertising (like putting their name on the back of the dugout).
Here are some other bat rack ideas:
http://www.batracks.com/

benches4kids.com