step 1. get the proper line(to do so you will need to take your old line to a parts supplier(maybe napa) and ask for appropriate line (there are available in several diameter and using the wrong one = lots of confusion and frustration).
step 2. check see if your fittings are not stripped and the proper wrench go on the easy and your bleeder is not stuck if stuck remove by heating or go et a new caliper. If every thing good skip step 3.
step 3. get the fittings either from Nissan or by providing your selected parts supplier with your own fitting. Check fit by threading them inside your caliper. (note: there is a possibility that the fitting on the caliper side are not the same as the brake cylinder side make sure you get the correct fitting for every connection)
step 4. borrow/buy/rent/steal a flaring kit with a lot of fittings. (skip step 5 if going with this path)
step 5. find to a proper mechanic above the age of 30 (not a chain shop like active green or midas- avoid them at all cost).
step 6. get the lines made by the shop. or come to Oshawa and i make’m for ya (BRING BEER FOR MY BELLY) or YOUTUBE!