The process goes something like this: Okay, SICP sounds good. They're using LISP. How do I make a LISP program? The internet says SLIME is THE way to go and I'd be an idiot to try any other development environment. Ok, I guess I'll just install that... (3 weeks later)... okay that didn't work. Screw this, I'm learning PHP.
That said, the first term of my freshman year of college used SICP as the textbook. I banged my head against a wall for the first six weeks and had an epiphany in week 7. It's the best feeling in the world when functional programming finally makes sense.
I believe people that say it's awesome and I look forward to tackling it someday. But it is not a good way for a person to dip his first toe into programming.
That said, if you have something you want to build starting with a project and an appropriate language and ecosystem (including instructional material) is very good. I myself started out in a high school punched card IBN 1130 FORTRAN "IV" course, but soon started a project that really got me going.
I didn't try SICP until half a decade later; by then I was an experienced imperative language programmer (mostly C by that point) and fairly experienced in Maclisp and Lisp Machine Lisp. At which point it really made sense, both in terms of being able to understand the material and why it was really important.
SLIME is supposed to be the way to go for a complicated LISP like Common Lisp or perhaps a richer Scheme or Clojure, but SICP is trying to teach you programming, CS and the like, and what you learn from about Scheme is incidental (well, until you get the the metacircular interpreter magic).
Learn PHP. You know more than you are letting on, because you evidently understand exactly why PHP is a big success. Get some stuff done. I assure you that the websites you build with PHP are real websites, and the money you earn with them is real money.
Given that I work at a Drupal company, I would be remiss if I didn't suggest that learning to build sites with Drupal is a great way to learn to work with PHP, Javascript, a web stack, et cetera. The community has lots of people who are coming from just the same place that you are.
From CSS, an obvious way to go is Javascript or PHP, or better yet both.
If you think that you don't want to build a specific thing, but instead want a birds-eye armchair view of the essence of what programming is about, don't waste time; try SICP:
http://groups.csail.mit.edu/mac/classes/6.001/abelson-sussma...
But odds are that you'll quickly find that you don't actually want to be a computer scientist. ;) You want to build something. So find an example of the thing you want to build, learn what it was built with, then learn to program that.
Bonus advice: Whenever you don't know what else to do, learn about Unix, find a new feature of your text editor or version control system, or study regular expressions.