This is the official Google LG G watch User manual in English provided from the manufacture.
Download LG G watch User manual
Country: United Kingdom
Language: Englsih
Download:LG-W100_UK4_UG_Web_V1.0_140709.pdf
Country: Australia
Language: English
File format: PDF
Download: LG-W100_AU4_UG_Web_V1.0_140705.pdf
Google G Watch owners also can visit here to find out Google’s support documents for G Watch.
[Update]
LG also published the G watch user manual for G Watch users in South Africa and Philippines today.
Country:South Africa
Country:Philippines
Enjoy your LG G watch.
Learn how to reset your LG G watch Here