How do I get to Sanhen village from Hefei and how long does it take ? how do I get to Chao lake ?

Do you mean the Sanhe Village instead of the Sanhen Village?
If so, you need to go to the North Gate Station to take the bus to Tunxi, Huangshan City and then transfer to Taiping. Then you will find the bus for Sanhe Village.
To reach Chao Lake, you can go to Mingguang Road station to take the direct bus.
In Chao Lake City, you can take the No. 3, 9, 18 to reach the hot spring.
Laoshan? Do you mean the Laoshan in Shandong Province or in Anhui? I do not think there is Laoshan in Anhui.