I need your recommendations for my web site design for the following:

1- Colors of the themes, background etc.
2- Objects used on the pages
3- Ziyaretci Defteri (Guestbook) problem still needs to be solved. It does not accept Windows-1254 chareset. It only works with UTF-8, so not accept some of my native language characters
4- SEO improvements (That is the most important one!)

The website: www.sihirlidegnek.com