Family Education.com is a great online resource. Check out all the information the have to offer. The link below will take you directly to the homework help section. Great ideas to help structure and reward homework time and completion.
As an Occupational Therapist I highly recommend that we all remember to help our children learn in various modalities. If you have a child who does not want to sit for a long period then then play catch while practicing those spelling words and / or write them in shaving cream on the wall during bath time.
http://printables.familyeducation.com/forms-and-charts/school-forms/51555.html?detoured=1