TheBC Rookie

I have been searching for upgraded fuel lines and fuel vapor lines (because I heard after so many miles they need replacing) so I started looking and heard alot of people upgrade to AN lines and fittings. Only problem I have is knowing what sizes to buy and which fittings. Because the site I go to doesn't just have like a kit and me being new to fuel lines on a 240sx I couldnt even start at which sizes and parts to buy. If someone can lead me into the right direction here is the website I go to.

< http://www.injector.com/fuellines.php >

Please all comments and replies are needed.....ALL.

P.S. Is there something easier or someone who makes these as kits?