How much are you looking to spend?
www.pbnation.com, lots of info and what not there.
+1 on the Tippmann model 98 or A5, those are pretty much bulletproof markers to start with. Or you could look into one of the million Kingman Spyder variations as those are pretty popular too.
For a good starter electro, check out the Smart Parts Ion.
Skip the CO2 and go straight to compressed air, tanks now a days are pretty cheap and the consistency is worth it.
If you don't have it already, spend some money on a good mask first. Gun will do you no good if you can't see because the mask doesn't fit right / keeps fogging / etc.