The Posthuman guys offer free downloads of all Eclipse Phase material released thus far under a Creative Commons license, so you could get all of it legally and for free, and then buy it later if you feel you want to support them.
The big thing with Eclipse Phase is that it is complex. Most sci-fi settings are "like today, but with X" or at most, "like this other popular setting, but with X." EP has all kinds of different sci-fi and transhuman elements mashed up in it, so it's going to be difficult for new players to understand it all. If you want to make it a little more manageable while introducing new players, you should make the game more plot-driven, so that they always have a clear idea of what to do.
Another thing is that character creation is a little bit obtuse. There's a bit of mathematics involved and a lot of different options, and if you want to go back and change something in the middle of creation, you may have to recalculate a lot of derived values. On the plus side, there is a
handy spreadsheet that helps streamline the process, and also a good variety of sample PCs in the various sourcebooks.
RPPR has some good resources on EP. There was a
podcast episode dedicated to Eclipse Phase, and if you check the AP archives, you'll find that Ross ran
an introductory game, where he solved these problems. If I were to introduce new players at this point, I'd probably run them through that, or something close to it.
Finally, there's the official Eclipse Phase
forum. It's a great place to look for inspiration and ask for advice.
Good luck!
