how to know that in which page my website is coming in Google search?

[Jake]

You can just manually look through the search results, if it is not in the first 3 pages of results it will probably be of little benefit, 90% of search clicks are on page 1. Be aware that Google personalized search can make your site come out higher in rankings on your computer after seeing you repeatedly viewing it.

Bear in mind one normally gets visitors using a variety of search phrases to find your site, you need to check a number of thee keywords to gauge the progress of your campaign, there are tools that can automate the process of checking rank for a list of keywords, checking more than perhaps 10 at a time might cause Google to stop serving results for a while, changing IP addresses if you can helps it to continue.

You could use either the free rankchecker for firefox http://www.link-assistant.com/rank-tracker/ to generate a search ranking report for the list of keywords, the latter has some other analysis functions.

Using tracking tools to monitor the actual search phrases that are bring visitors is important, not all keywords have the same value. "How fisheye lenses work" is not as valuable search for a business as "SLR camera prices" the free Google analytics can provide more data than you can digest, Statcounter.com is a lighter wright easy to use tool that gives more useful information than an odometer hit counter.