You definitely want to use zip ties on the lines that you won't be pulling off very often and they have little spring clamps for the lines that you'll be removing for filling. I'll get you a picture a little bit later. You should also put an inline filter in the line to the carb. If you can't see the fuel tank during filling, then you will always have to pull the line off the muffler as well.
During operation, the back pressure in the muffler is what pushes the fuel into the carb. The muffler pressure goes into the vent line which should be at the top of the tank, then pushes fuel through the clunk into the carb line and into the carb.
When you fill the tank, you pull the line off the carb and attach the line from your fuel pump. You pull the line off the muffler and let it hang where it won't spray fuel on your plane.
Start filling your tank and when it's totally full, fuel will reach the vent and start coming out of the line to the muffler. That's when you know the tank is completely full. You never want to run with less and risk losing power. Also, even if you only fly for two minutes, it's worth the extra two minutes to top off the tank before you go up again.
Back to the lines, definitely zip tie the ones that won't be coming off and use a clamp on the other two. Also make sure you have enough slack in the lines to prevent them being pulled loose in flight. I had that happen on my big nitro cub last year. Fortunately I was in a very large area and it floats like a big kite so I did a 180 and landed no problem. Zip tied my lines and continued flying without incident for the rest of the day.