Personally, I just ask the client to bring in all of their 1099s and list out anything that they think might be deductible but Google is still my friend:
https://www.google.com/search?source=hp&ei=dmcuXIr6CYrMjwT725WIDw&q=form+1041+tax+organizer&btnK=Goo...
Slava Ukraini!
