drain plumbing

Hi, I am a trying to finish my basement. During the process, I wanted to add a bar sink at a location. In order to plumb everything correctly, I needed advice. The sink for the bar is about 12 - 13 feet from the nearest drain pipe which has been provided for a sink in a half bath. Half bath has...

http://imgur.com/a/FgrFZ I've had to elongate this drain to the wall since I'll be using a linear drain. I understand that I should be pitching the drain pipe about a 1/4" for every foot, but I'm not understanding how I could do that and then also make the drain pipe flush to the floor? Does...