what is the structure of a good essay?

Answer 1

what kind of essay?

but essentially thesis, body, conclusion

Answer 2

It's like a good speech -
1) Tell them what it's about
2) Tell them the main content, in a organized fashion, with discrete points (paragraphs) that relate to the main topic
3) Tell them what you told them, i.e. summarize

Example (a silly one, but an example) :
I'm going to discuss why I feel fish tanks should not be allowed on airplanes.
1) There's a lot of water that would make a mess
2) The glass could possibly break and be a danger to everyone
3) What would you charge for a fare? Too much confusion
So you can see why fish tanks should not be allowed on planes.

Answer 3

solid paper, a clean blue or black ink pen (or type-written) and staples (if necessary).