Based on the FAQ:
1) If I get in a plane, and go East, if I keep going East long enough why do I get back to the place where I started?
A: You need to have evidence for this to be true. Also, define "straight." Remember, the northern point on the compass is pointing toward the center of the Earth. If you follow your compass due east or due west, ending up at the same point you started from, you have just gone around the world in a circle. Thus, circumnavigation is possible on FE.
2) Why has no one been to the other side of the planet?
This isn't answered directly, but I'm guessing the Ice Wall gets in the way.
3) Why are there no pictures of the edge of the planet?
I've not seen an answer to this. The general reply is "Read the FAQ". There is also a model that suggests the Earth is infinite, so obviously you won't find the edge. And pictures are never considered to prove anything here.
4) Why has no one fallen off the edge of the planet?
Ice Wall. Duh.
5) How do you explain Eclipses, half moons, full moons, and things of the sort?
(From the question about Lunar Eclipses.) A celestial body, known as the antimoon, passes between the sun and moon. This projects a shadow upon the moon.
6) How does the sun orbit the planet?
Look at the 3rd post on the FAQ, and there's a diagram
http://www.theflatearthsociety.org/forum/index.php?topic=1324.07) How does the moon orbit the planet?
Didn't see an answer for that on there... We
both need to lurk moar.
8} If we are constantly going faster we would hit the speed of light, then exceed it.
That's not a question.
However, maybe this (from the FAQ again) will answer your non-question:
Q: "In the accelerating Earth models, how does one reach terminal velocity?"
A: Once the acceleration of the object is equal to the acceleration of the Earth, the object reaches terminal velocity.