customize themeforest theme

I have a wp theme from themeforest that I need csutomized. The theme is wp bike it under the retail category in wordpress themes. I will supply pics and logo. I need the logo to have a transparent bg, pics may need to be resized and sharpened so look correct, the other I need the theme customized to have the same layout/settings as the demo site but with our content and pics. I need the theme installed on a dummy site so we can look and make tweeks before installing as our active theme.