Your wife will be granted BOWP as a dependent applicant, in which being under condition to your status.
Simply go myCIC and apply for the work permit. Since you have no ref number, you may need to complete questionnaires. Once you finishes answering all questions, you will have a list of documents to submit for both you and your wife.
Generally, you will need,
IMM5710 and etc CIC forms
Fee receipt
Passport copies
Current WP copy
BCPNP Nomination letter
AOR letter
Merriage Cert
Letter of employment (or so, like Job offer letter)
And your wife will need,
IMM5710 + IMM5475
Fee receipt
Passport copies
Current WP copy
Cover letter that states PA(which is you)'s UCI# and EP#
for more, refer "Extend your work permit – Economic class applicants" section at CIC website. (Sorry, I can't attach link here since I'm not allowed yet.)