Here are some really good websites for teachers who need a little help creating lesson plans!

http://teachersnetwork.org/teachnet/ele_science_astronomy.cfm(This website already has lesson plans set up and all you have to do is look over it and if need be modify it a bit to ensure it is appropriate for the ages you are teaching).
http://www.edhelper.com/?gclid=CKbik4GDh5kCFQrAGgodIHEPng (This website lists different grade levels and then once clicked on there are different lessons involving different themes. However in order to actually retrieve these lesson plans you have to sign up to be a member but it is free)
http://www.lessonplans4teachers.com/socialstudies.php (This website is entirely free and you do not have to sign up to retrieve any lesson plans. The lesson plans tell you what grade level they are for and what subject it is).
http://www.lessonplanspage.com/(This website lets you choose a topic such as math or music then lets you pick what grade level you want and then you pick a lesson plan that you want and it is all free)
http://www2.scholastic.com/browse/lessonplans.jsp (This website has thousands of different lesson plans for many different grades and like the other website you can pick what grade level is desired)