Below you will find a variety of field data sheets. The first set is relatively "generic" and may work for you "as is" or with a little modification. The second set is more topic specific, but should give you an idea of what detailed field data sheets look like. Feel free to use any of them, or modify them as you like!
Note about printing: It's helpful when printing out from excel to go to Print, Page Setup, Sheet, and make sure the Gridlines box is checked - this will ensure that the grid you see in Excel gets printed on your data sheet.