How big a spike can you expect if you suddenly get into the first page for a well searched term. Currently I am getting some page impressions by being found for 3/4 word search phrases on some pages, but i want to get found for the 1/2 word phrases for those same pages. How do I go about doing this because I feel the keyword density is fine and the its also in the title of the page. Is it basicall a matter of building up links?
If it is MSN you're talking about, it depends on the search frequency. I made a LOT of money for a well searched term and being #1 on MSN.
Your question is pretty vague. You are asking how many visitors you'll get from a generic search term...what is the term? That would help with a more formulated answer.