JQuery and WordPress styling tinyMCE

Hi, just working on a site at the moment with some JQuery. I read an article somewhere online saying you don’t include JQuery the normal way (a script source) and that you must do it the wordpress way. How important is this? Can anyone shed any light on it?

The other thing, completely different matter, does anyone know how to style tinyMCE editor? Im doing some custom meta box stuff and want to put a background image and change the font color inside the tinyMCE field. I’m competent with CSS but i can’t get anything to change…I rooted through the raw tinyMCE files in the backend but found no CSS of relevance. Any ideas?

Thanks ??