“I currently collect SSD & alimony $650/mo. Will the alimony affect my SSD? Also, I’d like to work a little, can I work in addition to alimony & SSD.”
This is a very tricky question, because it involves the interplay of both Federal and state law, as well as being informed by the terms of your actual alimony decree.
In order to get a helpful (and, indeed, accurate) answer to your question, you need to consult with an attorney in your own state.