AVKO's Sequential Spelling program is very effective and is very simple to use. No preparation required on the part of the homeschooling parent or teacher. The student doesn't have to do any copywork or busywork in order to get the benefits of the program -- but these may be used to reinforce or review the words or the lessons.
This new graphic shows how the word families presented in Sequential Spelling build both vertically and horizontally. See how there are teachable moments embedded in the lessons -- contractions, tricky words, possessives, names, etc. See the cross-referencing to The Patterns of English Spelling (available for free with membership as an e-book) and important rules or spelling notes in the footnotes.