Queries about insurance claim cases

I am going to consult a law firm like Campisi LLP in Vaughan to claim my insurance. I have some queries about this. Normally when we approach such law firms for insurance claim cases, Will we get a free consultation? What will be their approximate charge to handle this case? And do we have the option to pay them after getting the insurance amount in our hands? Why I am asking this is, somebody told me consulting lawyers will be highly expensive, especially for insurance claim cases. Please help me to resolve my queries.