APS poster guidelines
http://www.aps.org/meetings/policies/posters.cfm
A website associated with the book: Alley, Michael, The Craft of Scientific Presentations, 2nd ed. (New York: Springer-Verlag, 2013).
http://www.craftofscientificposters.com
MIT SPS resources for posters
https://sps.scripts.mit.edu/posters/resources.php
APS talk guidelines
https://www.aps.org/meetings/policies/speaker.cfm
Advice to beginning physics speakers (Professor Garland in Physics Today)
https://www.phys.ufl.edu/courses/phy4803L/resources/OralAdvice.pdf
"Professor Mozart's" perspective (courtesy of Professor Mermin)
http://www.phys.unm.edu/msbahae/physics568/WhatsWrongWithThoseTalks.pdf
Rule of thumb: aim for the type of paper submitted to Physical Review Letters with length limit of 3750 words of main text. Such papers are intended to be of interest to a wide variety of physicists, including those who are not specialists in the field of the paper.
See:
APS short paper length guidelines
https://journals.aps.org/authors/length-guide
We are not requiring strict adherence to the technical guidelines for APS journals, but it is good to know what they are:
https://journals.aps.org/authors/tips-authors-physical-review-physical-review-letters
A guide to writing by Prof. McClean at SUNY-Geneseo