When you Google for this information you gets lots of pages that give you a really fancy prompt. If I have to write/copy so much code to just get a simple prompt then I'm not doing the work I am being paid to do!.
Here is what I use everyday (put it into your ~/.zshrc):
PROMPT='%B%t%b %n@%m:%0~# '
This gives you a prompt similar to:
If you wan to see what other options you have do "man zshmisc".