VAG-com rookie

I just recieved my first VAG-com in the mail. Using hardware from www.millisi.net and hardware from Ross-Tech. Any words of advice, a heads up... what's the crash course? Anything you feel is important or prudent. Here are the codes my car is reading (haven't figured out how to reset them yet, and ross-tech wants $100 for some stupid ass lisence)...

16486
P0102
Mass or Volume Air Flow Circ Low Input

16536
P0152
O2 Sensor Circ.,Bank2-Sensor1 High Voltage

16795
P0411
Sec.Air Inj.Sys. Incorrect Flow Detected

16804
P0420
Catalyst System,Bank1 Efficiency Below Threshold

So what does it mean? Best guess?? The o2 sensors are brand new, 6 weeks at the longest. Help please, my car is running like crap lately and I've gotta get it fixed.

I love the vag-com, but i'm kicking myself. I bought a cheap chinese knock-off (literally from china, not a slur) and it didn't come with software, and it won't work with the new version of anyone's freeware... only old versions. Let the be a lesson to all who are considering it. Pony up the $250 and buy the genuine part because you'll have to do it anyway.

Get a Bentley manual to help you understand how to use the software. Looks like the MAF is bad & possibly the bank 1 cat. Check the hoses to and from the secondary air injection pump.