Backlinks for amazon affiliate website

i had amazon affiliate website age of 10 months old. still not started the earning from it. Last month its ranked 50 keywords but last week i have checked again and now the count is 34. what is the reason for this? and could you guys guide me what kind of resources good for creating backlinks manually. my niche is kitchen accessory.

** If this post in wrong section please route me to correct path..

Thanks all