OK, I'll bite! 1/8" tubing will be just fine and I prefer to use the barbs. Push the line well past the barbs and secure with a nylon tie behind the barb. The ties only job it to keep the line from sliding off and doesn't have to be excessivley tight. The barbs will make the tight seal with the line. Other methods are also in common use and many work very well. Someone will chime in with these methods I'm sure.

The felt Walbro clunk filter works excellent and has a reasonable price at most any good hardware or small engine shop.

The DuBro red stopper is the one to have. Good luck with your project!