If I have 15 to 30 minutes a day for seo what should I do?

I have free time every evening and want to get my site on page 1 of google! How do I spend my time?

Frankly speaking my friends try to give some more time for seo because it's not enough time. If you want to shows your site on top of the search page then you should do lots of things. But can you define some more details for your site then I gives some specific information.