Alterations to my x-cart installation

I have a number of things I would like done relating to the xcart shopping cart on my website. - I would like to database to be examined to make sure it's completely valid and intact. - I need xcart to be upgraded to the latest version which I just bought. - I would like the color scheme of the website to be changed to having a black background with primarily yellow text, with the rest of the text being red and green.