Okay, here is a deal:
First you should get some stuff:
1 Odin direct click
2 Clock Work Mod direct click
3 Your favourite pack can be found here just select your phone then on the righ click Android Open Kang Project (page will return you 2 options: first is a system, the second is addon google apps)
4 If you want google apps you should also download this addon (if you followed my link from point 3, this gapps pack should be visible after clicking at AOKP distro)
After getting all stuff we should do something with that.. UP
First, run app as administrator Odin exe, click on button PDA and select Clock Work Mod (first unzip it) pack to flash it (file extension should be like tar.md5).
If you are lucky everything should be finish without errors. Phone should be restarted
Second, put on your phone sdcard 2 files: open kang package in zip and also gapps (if you downloaded it btw).
Third, turn off phone. Click then Vol up + home + power, you should get CWM system on
(power button = enter, vol up/down buttons = arrow up/down).
Find option: wipe data/factory reset and run it, also do the same with wipe cache partition. Then select install zip from sdcard > choose zip from external sdcard. First select your rom (not gapps! it should be installed secondly!!) and install it. Then select gapps and also do the same thing - install.
If everything finish with positive status, select reboot system now (if you cant find it, select +++GO BACK+++ ).
Loading will take some time but not longer than few minutes ~4