SEO..a must in ADSENSE  

Search Engine Optimization
Of course, once you’re up, people have to know you’re there. One of the
most important ways to do that is get yourself a high-ranking in a search
engine.
There are lots of different search engines, but only three are really
important: Google, Yahoo! and MSN. In Chapter 21, I’ll talk in more detail
about improving your search engine rankings.
If you want to take a shortcut, there are plenty of companies which will make
the submissions for you and they’ll even optimize your site to get you as high
on the rankings as possible.

Links
Your search engine ranking will depend on a number of factors. One of those
factors is the number of sites that link to yours. As far as Google is
concerned if lots of sites about model railways link to your model railway
site, it must be a pretty good sign that people who like model railways think
your site is good. So they’ll want to offer it to people who search for model
railways, bringing you lots of free traffic.
Once you’ve got your site up and running you’ll want to persuade other sites
to give you links. You could offer to exchange links and you can even set up
a page that contains recommended links so that you’ll have somewhere to
put them.