Our youngest, 12, has dyslexia and dysgraphia and it looks like maybe an auditory processing disorder as well. Here is what I suggest bringing up at the 504 based on our experience:

Dictation allowed on long reports
Alternative assignments that do no require writing, i.e. video report
Scribe on long tests or those heavy on writing
Peer or teacher provided notes in lieu of copying from the board
Typing instead of writing; access to class computer for note taking, etc. or permission to bring her own device such as an iPad, laptop
Calculator allowed on math work where rudimentary computation a process of the assignment and is not directly being tested

As my son's second grade teacher said, "When he dictates his stories, his sub-plots have sub-plots. When he has to write his own story, he doesn't even get to the plot."

There is an amazing group of parents here with great advice. It's been such a help to me - if only to not feel so alone in it sometimes.