Been playing one for years, I was even in a Chinese Orchestra at one time. Its a beuatiful instrument, once you get the vibrato, string bends and the thumb picking down you'll really enjoy it. Learning to read Chinese tab was a challange but I thouroghly enjoy my Gu Zhengs (I have two). Here is a link to The Sound of China they sell instuments, music books, dvd's/cd's and there is alink to a Gu Zheng forum on their site. Enjoy!!
https://www.chinesezither.net/
http://www.guzhengforum.com/