The caliper will likely have a flexible rubber brake hose attached to it already. You will connect that to the hard line. In terms of specifics you might just need to trial-and-error the right-sized wrenches -- make sure you don't strip any of the fittings. Take a look at any BBK installation PDF - those will give you guidance on how to work with the lines.
Here's one for example:
http://bd8ba3c866c8cbc330ab-7b26c6f3...Piston_BBK.pdf