Which is the best way for my site to be at the top of the searches

Hello eduardomay-ga,

There are a couple of things I can suggest you do. 
1. Good Page Titles:
"A match between the search phrase and the words in a page title is
considered a very relevant match by the search engine and thus it
ranks higher in search results than pages that only have those words
in the page's text."

2. Smart Page Text:
" By smart, I mean page text that not only reads well to the visitor,
but also contains keyphrases that searchers might type. And remember
that the higher on the page a phrase appears, the more relevance it is
assumed to have."

http://www.bbd.com/search_engines.htm
://www.google.com/search?num=100&hl=en&c2coff=1&safe=off&q=how+to+improve+search+rankings&spell=1

If this answer requires further explanation, please request
clarification before rating it, and I'll be happy to look into this
further.
Nenna-GA
Google Answers Researcher

Good answer for the money I paid

You have several options here. The way that may provide the best
results is to hire a consultant whos area of expertise is search
engine promotion. This expert will do several things such as tweak
your page URLs, suggest keywords, etc.

An easy tip at this point is to make sure the URL of your pages are
named according to their content. For example,
www.site.com/american-birds will rank higher than www.site.com/page1.

Some people like to insert lots of meta-tags and keywords into their
webcontent and code. However, while this might be of a little help,
the most concrete way to rank higher is simply to offer better
content. Also, be wary of engaging in "link-sharing" where you post
someone elses website in exchange for them to advertise yours. This
shows off unprofessionality.

Thank you for the compliment and rating, I'm glad I could be of help.

Nenna-GA

You have a whole lot of work to do. First start by doing some
educational research about search engines. You will want to optomize
your pages for keywords, in addition you will want to increase the
number of quality links to your site. I like to start with topic
specific directories and build from their. Vary the text used to link
to your site when adding your listings to the directories.

The following article will help you with keywords:
http://www.small-business-software.net/determining-keywords.htm

and the following directory will help you find topical directories
that allow free listings:
http://www.web-search-engines.net