Treat your initial meeting as an interview
Most recruitment consultancies will want to meet you in person before formally putting you forward for an interview. This will generally involve a fairly informal chat about your reasons for wanting a new job, the type of role(s) you are interested in and a discussion around the positions the consultant thinks might be appropriate for you. Often, the consultant may have a specific job in mind.
While the meeting will not be as intense or probing as a formal job interview, you will still need to come across as professional and employable. Bear in mind that a consultant’s reputation with their client (the recruiting company) is at stake when they put a candidate forward for a job, so he or she will want to make sure that you will perform well when you meet the recruiting manager in person.