Customise a Wordpress Blog

I have a small wordpress blog called [login to view URL] which I would like redesigned. The site is currently using an adsense them but most users who find the site leave immediately. I do not know what is causing this but feel they are put off by too many ads in too prominent a position. The work I would like done is; 1)I would like category buttons across the top of the page under the header, to make it easier to find posts. 2)Alter the adsense ads as you see fit, to increase clicks without being over the top advertising. 3)Create a home page and category pages to give some structure to the site.