"Simple"? Okay, so no technomancy. . .
Hot-Sim VR, Stealth program as good as you can get, Exploit program as good as you can get.
Hacking 5 (or 6), specialize in exploit, Cybercombat 4, Electronics 4
You'd probably want some infiltration skills b/c a good GM's going to have some nodes you can only reach from behind corp sec. Buy the best comm-link you can and see if your GM will let you upgrade it (SR4A, pg. 222) before play.
That's the simple stuff, to my mind, I'm sure the more experienced guys are now going to explain what I've told you that's utterly wrong and will get you killed in 2.5 IP.