[Galaxy S III General] overflyer:
OK, dude. We all were beginners once. Me not even so long ago so I'll explain it to you as easy as possible:

1) a. Search Google/XDA for a thread for how to root your S3 with ODIN

b. You should end up downloading Odin 3.04 or better yet 3.07 cause its newer and the flashable zip file which roots your phone

named "CF-Root-SGS3-v6.4.zip"

c. CF-Root-SGS3-v6.4.zip will be about 8.6MB in size. Unzip it and you'll get CF-Root-SGS3-v6.4.tar which should be about 27MB in size

2) a. Turn off your Phone

b. Wait 5 seconds

c. Hold the Home Button and Volume Down button pressed and WHILE YOU HOLD those two buttons turn your phone back on. And dont

let go of it until the Samsung Galaxy S3 i9300 BlacknWhite Boot Screen diappears and the download mode appears

d. Now the download mode will ask you to press the Volume Up button to continue, but before you do that connect your phone via USB to

your Windows PC with ODIN on it. As a matter fact kill all instances of KIES with the windows task manager before you open ODIN!

e. After the phone is plugged in to USB press Volume up.

3) a. Start ODIN

b. The first field with the topic ID:COM should be filled green or blue shown some number of COM port. That means your S3 has been

recognized. If its grey the phone wasn recognized. This is most often due to faulty S3 USB driver configuration in Windows. If your phone

is usually recognized by windows when you do other stuff like file transfers it should work. Or get the

SAMSUNG_USB_Driver_for_Mobile_Phones_15160 and de/reinstall it.

c. Make sure ONLY Auto Reboot in ODIN 3.07 is checked or ONLY Auto Reboot and F. Reset Time in 3.04. DONT CHECK ANY

OTHER boxes. If there are other boxes checkes, uncheck them.

d. Click the PDA button in ODIN and browse to your CF-Root-SGS3-v6.4.tar file (tar !!!NOT!!! the zip file).

e. Press start. Dont mess with your phone, the battery, the usb connection, your main power or whatever. Just let the process completely

finish.

f. If it says PASS its finished and it will reboot automatically. You can now exit ODIN.

Congrats your phone is rooted. From now on Im not very sure whats the cleanest way to flash CM anymore since the 0/0 "problem" and the no menu bar problem after the first time you flash it. Since you seem to be very new dont panic after the first flash of CM10.1 and it looks strange with no phone button and app menu button etc. I got the same problem. relax your phone is not broken.

What I would suggest.

1) Get the newest CM10.1 version here: http://get.cm/get/jenkins/16908/cm-10.1-20130102-NIGHTLY-i9300.zip

2) Copy it into the download folder of your phone

3) Make Nandroid AND Titanium Backup backups

4) Flash the cm-10.1-20130102-NIGHTLY-i9300.zip with the ClockWorkMod Rom Manager that you will now find on your phone since its rooted now.

5) After its flashed dont reboot. Do a Factory Reset and use every cleaning point you can find once: Cache, Dalvik Cache, Fix Permissions, Battery Stats

6) Reboot

7) Not sure whats gonna happen to you now. If you are asked to configure your phone and accounts now thats a good sign. But its still possible that there are no icons anywhere.

8) If so: Connect your phone to your PC and copy all the data from the /0 folder to your root folder and overwrite it.

9) Unplug and Reboot. How does CM look now? You should see your phone kinda like it was with the old S3 Stock configuration. If thats ok keep it

10) I did something like that. I downloaded a build of CM10.1 one day older e.g.http://get.cm/get/jenkins/16700/cm-10.1-20121231-NIGHTLY reseted it again.

11) If there are no icons, again, use the two finger gesture and pull down the top bar to get into quick settings: Go setting --> About phone --> Cyanogenmod Updates --> Select all update types inlc nightlies --> search for updates --> download newer version again. Let CM do the Update process when finished. Do the factory reset, again in the recovery mod where you are now (notice that it looks different from cwm, huh?!)

12) Play with the /0/0/0...... data copying to root folder and flashing of diffierent CM10.1 versions until your phone runs smooth.

After CM runs fine and you can access your apps download ClockworkMod ROM Manager (Black hat symbol with orange arrow) and flash ClockworkMod Touch Recovery for the i9300. Reboot. Everything's done. From now on just update CM10.1 via CM-OTA: Settings --> About Phone --> Cyanogenmod updates. Use Clockworkmod to flash modem and ril drivers which should always be matching such as "modem_ril_ELL4.zip" e.g.

Ill never go back to stock, again.

Hope I kinda helped since im far away from being a pro.

Greetz

over;)

EDIT: The 0/0 problem for me was pretty bad since i switched from stock rom. I hab it back on after CM10 because I was planning on selling my S3 and than buried those plans, again .Maybe if you dont switch from stock its a piece of cake.