Not them, but this is the info we have; I was paying for in-search adverts across multiple search engines, I was commissioning custom made adverts to place

Not them, but this is the info we have; I was paying for in-search adverts across multiple search engines, I was commissioning custom made adverts to place in online used car market places. I was spending time optimising the 'bid' in automated advertising system, trying to get the best bang for buck My questions, * custom made for whom? * How did they select them? * When did they show up? * How were those terms selected? * What terms did they select and which performed better? * Did they track visits using different ones to see which had the best conversions? * Optimizing can be most impressions or for quality. Basically show to as many people as possible vs fewer but better conversion. We don't know here, but I see most people doing most impressions.