Confused about Joomla, can i use it alongside my existing CSS/HTML page?

[DJMK4]

Im looking into joomla for content management, but its going on about templates etc, it looks like something that can build a blog etc.

Before I start spending my hours reading up on this, all I want joomla at this stage to do is to easy manage my content, I have my own CSS template that I have created, can this be done? or is Joomla a whole new way of creating websites?

 

[DJMK4]

Anyone?

As an example, say if i had my own CSS design, and I had a mainbody div, and a sidebar div, instead of editing each individuals page html file with the content, I would like to update it from a single location, including the sidebar which will be a newsfeed (so it will be the same on each page).