WordPress - Give it to me straight

Hi Guys…

Firstly, I know that this might be on the forum somewhere so I apologise for bringing it all back.

I need to know a couple of simple question regarding WordPress and be pointed in the right direction. I’m using other CMS tools, and clients seem to be finding it hard to use so I need an easy to use solution for them. Expression Engine i’ve tried, but again clients are not really happy.

WordPress - I understand this is a type of CMS tool, however can your own designs be implemented into WordPress. I mean full CSS, HTML, JAVASCRIPT, FLASH etc…

If so, can someone kindly tell me how or point me to somewhere where I can gather more information to get this done?

Thank you all in advanced…