Recommended print text, if willing to purchase (optional), is the Oxford published one edited by Martin Smith - available at the following booksellers:
Powell's
AbeBooks
a libris
Barnes and Noble
Amazon

Possible online texts:
PDF - http://www.magisterwhitchurch.net/Latin%20240%20May%20schedulePetroniusPacket.pdf
(check whether this is the full text or expurgated)

http://www.archive.org/stream/cenatrimalchioni00petriala/cenatrimalchioni00petriala_djvu.txt
Latin and the translation by Michael J. Ryan

recommended full text of Satyricon (still should be double-checked)
http://www.thelatinlibrary.com/petronius1.html

Vocabulary:
PDF - http://www.pullins.com/dload/00544LLVocPetroniusCenaTri.pdf
(Oerberg's vocabulary lists)

class wordlist
http://homepage.usask.ca/~jrp638/CourseNotes/cena.html


scheduling
Look - here's a class syllabus for studying the Cena
http://uts.cc.utexas.edu/~timmoore/petronius_syllabus.html