With about 350 active chapters, there are differences from chapter to chapter of course, but there are certainly things that all chapters have in common. (We may be able to give more specific advice if we knew what school, but maybe not.
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First of all, Rush for Alpha Phi Omega is less formal and structured that the Social Sororities. I've known brothers (which includes both males and females) that when they first showed up (as non-members) for Rush events didn't know much more than that we were a service fraternity.
Knowing about a service project or two that the chapter does will give an ice breaker, but they're likely to tell the rushees about them anyway.
There will almost certainly be information on service projects that the chapter is doing between now and pledging, if they include information on when they are, I would consider that as an invitation for rushees to attend.
Given the rush activities at this time in the semester, I expect the pledge ceremony to be sometime in mid to late september with the brotherhood ceremony before the end of the semester. Nationals expects the pledging process to take between 6 and 10 weeks.
The national Rush pamphlets are available in the Membership Recruitment/Rush section of
http://www.apo.org/show/Publications...s/Publications
While no chapter will *expect* you to have read them during rush, the pledge manual and national pledging standards are also publicly available at and may answer some of your questions.
http://www.apo.org/site/site_files/pledgemanual.pdf
http://www.apo.org/site/site_files/n..._standards.pdf
Let us know what other information you would like...