Any serious speller will want to have a spelling notebook of interesting words they find, or words you have spelled incorrectly. There is no right or wrong way to create a notebook. I prefer to have a binder so I can add pages. Alphabetical is not the only way to organize, though it may work for some. I have my words organized by language of origin which is a good way to look for patterns. You may also consider sections for "words with silent letters", "words with troublesome double letters", "homonyms," or organize by endings for example - "ible" or "able" or "us" or "ous" - Whatever works for you.
If you have a good tip or list, please send it in to me using the Contact Me form.