I'll throw out a starting position - and a question.
IF the parties that want to enforce the no-fly zone act quickly, objective would be to protect the East Libya area centered around Benghazi. And to degrade the Libyan air forces. If they don't act quickly, may be nothing left to protect.
Question. Forces available to Libya. Do they have anything newer than Mig-23s? Or any high-quality SAM systems?