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10k from a broker is enough. From adwords there is no answer. You really need to track conversions and costs per keyword. you can pay 50 cents a click from a specific keyword and get 1:1000 conversions then buy a different keyword for 10 cents a click and get 1:10 conversions. I would guesstimate that 100 clicks from a specific keyword would give you some sorta results, but then again 1000 from a specific keyword is better. Adwords I would buy 1000 clicks from every keyword before guaging it's performance.
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