Also spelled as Dvapara Yuga, the Dwapara Yuga came to an end after the death of Lord Krishna. Kali Yuga started from here. It is said the Kali Yuga will come to end after the Kalki Avatar, the 10th avatar of Lord Vishnu.
The first thing to note is that why you need a Buddha statue. There are hundreds of statues and you need to choose for one. The basic reason is to help you achieve inner peace. The choice of path is yours own like happy Buddha, Laughing Buddha and so on. Listen to your soul before buying.
It is Lotus Pose depiction of the Buddha. In it he is seen sitting with legs crossed. His both hands are crossed and rested on knee. His head is on top of knee and hands in a resting position. It focuses more on inner peace.
The Shakyamuni Buddha statue refers to the teacher or Buddha who was born as a prince but left everything including palace to find true meaning of life. It is different from the Laughing Buddha statue, which refers to the character Hotei.
It depends on the purpose. There's no definite list like for calming down of nerves you can use lavender, chamomile, basil or Frankincense essential oils.
It is better to follow a book that defines all such usage in details.