Don't you have that backwards on the C/C++ part? C++ is the one with extra functionality, C is the basics
Forget scripting/markup languages to begin with. Worry about them later. They're pretty much irrelevant when it comes to programming (i.e., don't worry about HTML, CSS, XML, XHTML, DHTML, etc...).
Honestly, start with a classic beginner's language, either C++ or Java. I learned C++ first, but Java is a good first language too. I would stay away from C until you get a handle on C++, then go to C to get the extra functionality C provides. Then, if you're serious about doing some web work (database driven sites and whatnot), PHP would be really easy to learn. Also, if you learn Java, JSP becomes a real viable option for database driven websites.