You can find the System Reference Document for SA2 right here on the wiki! You can get there through the tab at the top of the page, or click on Character Creation, Game Play, or Major Technology right here.
If you would prefer a PDF, let us know in the Forums!
Download the demo of the 1st edition here: SA_Demo_v2.pdf (PDF format, 20 pages, about 1 MB)
And here's a character sheet: CharSheet_low.pdf
If you want to see how some people play the game, check out the play reports in the forums!