Changing Look Of OS Sites

[cranoldo]

Hello Guys, Im new to the community and would like to know how to make changes to:

 

1 . The look of the sites ( I read someware that this is done using css) ( how do I learn to use ? )

2. Add annimated headers ( flash banners etc )?

3. Video Files withing the pages?

 

 

Has any one used templates that have been created and sold by 3 Party venders?

 

Thanks

java script:emoticon(":'(", "smid_3")

crying.gif