Help Setting Up Google Adwords Keywords and Campaings

I have set up the basics of a google adwords account. I have added many key words and such, but when I spoke with the person at Google for our free consultation, it was clear to me that I truly do not understand the workings of their system and how to best attract customers who are looking specifically for my niche market product. I sell Christian themed, bible scriptures and inspirations made into graphics for walls. So I am not trying to reach and pay for clicks from just any individual, I am looking for the ones who are specifically and intentionally looking for Christian, biblical wall decals. Churches, and Christian individuals love these when they find them, and they are who I would like to market to. I was doing well at this before google changed their algorithym. Now it is like starting from scratch, and my business has suffered greatly. I only want help from someone who has set up a successful google adwords campaign before.