The first thing I ask my clients is to send me their text material beforehand by e-mail or fax to enable me to provide them with a detailed quotation. Of course, your documents will be treated strictly confidential.
Generally, the price per line will be calculated according to the number of characters in the target text (55 characters including spaces = 1 line).
As the expenditure of time required that depends on the scope of complexity and research or on the examination of reference material can vary significantly, your source text is definitely needed as basis for determing the translation fee.
In case of large-scale orders it is also possible to negotiate a flat fee.