First the bad news, there is no guaranteed way to gain top rankings for your website. Anyone that tells you differently is wrong.
It is extremely nice to type a word into Google and see your site at the #1 slot, but that just isn't always possible.  Some of our sites enjoy this position (please contact us for details), but this could change at any time.
However, there are established conventions that, if followed, give you the best possible chance.

We maintain numerous top ranked sites, and can advise you on how to maximise your keyword positions. 
Sometimes this will take the form of a design or content change, other times a carefully considered marketing strategy.
SEO is not an exact science, but we have over a decade of experience at your disposal, and a vested interest in improving your traffic.

Our website is a good example of a site we have successfully optimised.
It went from having no content or traffic to 1300 visitors per day inside of twelve months.  It has been featured on MSNBC and, appeared in the print version of Fade In magazine, where it was listed as one of the "Top 100 Coolest Film Sites on the Net",  is spoken about all over the blogosphere and continues to grow in popularity at a rapid pace.  This success can be seen by the fact that it now attracts paying advertisers.
This was all achieved with zero advertising budget.