Welcome to GT - it's always a pleasure to have another Pink Floyd fan on board! :D

As regards your first guitar, I'd personally suggest buying yourself an acoustic instead of an electric, to begin with. I know you want to rock, but an acoustic is still a good place to start. I started on a twenty-five-year-old 3/4 scale classical guitar! I'm not suggesting that you go to that extreme, mind you; but learning to play an acoustic will build up your finger strength very quickly if you practice hard. You will learn the basics of the instrument without the distraction of amp settings, tremolo bars, modulation effects etc, and can move onto the electric later.

If you really want to start with an electric, the Squier Bullet is probably one of the cheapest you can buy brand-new. You might also like to try a Squier California Series Stratocaster or Telecaster, or perhaps a Fat Strat, if you want something pricier. There are tons of smaller brands that sell copies of these guitars, as well. I'd suggest a Stratocaster or Telecaster type electric, because you want a versatile tone and a nice easy action to begin with. As your style evolves, you will probably move onto a more specialised (not to mention more expensive ;) ) model.

Anyway, have fun with the guitar, and I hope you like it here at GT!