Hi,
My XT Acerbis tank came with fuel lines, but you should be able to buy fuel line no problem from any motor-factors. Car fuel line is often thicker and more robust than bike fuel line. I wouldn't bother with braided, it's not in a very vulnerable position. I think you need line with a 5mm inner diameter, but I'd check this.
Mine didn't come with routing info. On the side where the fuel inlet to the carb is located the routing is obvious. The line from the tap on the other side I just poked it through the gaps. It goes up, then down, but works just fine. You'll need to get a t-junction to join the lines together before they connect to the carb.
You might want to put inline fuel filters in too. These are also widely available but make sure you get ones specifically designed for gravity feed fuel lines.
Matt
