You wouldn't think that its too advanced, but any kind of decent CMS is really quite advanced. Custom-made ones are complicated to make, and if you don't code them yourself, you probably won't get someone to do it for you. I haven't personally used any available today than the one I've been building the last four years, but as long as your web space supports PHP and allows you to create a MySQL database, any of the freely available ones should work. I would suggest choosing the one with the layout you like most, since I would imagine they all generally have the same capabilities. I think Wordpress may be the most popular at the moment, and has a mod called
Comicpress that a lot of webcomics use.
Some basic knowledge of any HTML and CSS would be helpful for customizing whatever you choosel, and there is
W3Schools for that.