[AT&T, Rogers HTC One X, Telstra One XL] dalvarez0312:
Welcome! I was new to all of this pretty recently as well but you'll find this community to be extremely helpful. The good thing is you already did the hard part, flashing roms on this device is very easy as long as you take the necessary precautionary steps. Since there is so much information on this forums, I know how hard it is to find simple answers at times with them being scattered all over the board and all so I'll just give em to you here:)

First off, make a "nandroid". Turn off your phone, then hold the power and volume down key until you get into boot loader mode. Then simply navigate the options to make a backup of your phone, very simple you've just made a "nandroid". Next boot your phone normally, go into the play store and search for and download the following apps:

1. Goomanager

2.SMS backup and restore

3. Titanium backup ( pay for the pro version if you don't want to reinstall every app one by one)

First run goomanager, it will ask for super user access, grant it. Then you need to install twrp (a third party recovery program that is preferable for our devices over cwm because it gives less problems) through goomanager by hitting the menu option while in the app and selecting "install open recovery script".

Once that is done open titanium backup and hit the little check mark at the top right, choose the option to "backup all user apps". Don't backup system data because if you restore system data when you flash a new rom it will give you problems since it is a whole new system, make sense right?

OK now open SMS backup restore and backup all your text messages that you don't want to lose. Make sure u sync all your contacts to your Google account for easy recovery as well.

Now you're ready to flash a rom. I suggest either aokp (which I use and love daily) or cleanrom if you want a stock experience without bloatware. I prefer aokp because I love aosp, the way android was meant to be and it doesn't kill your apps as soon as you leave then.

Either way you can try both and decide for yourself.

Download the rom zip file and transfer them to your phones memory, I usually put the rom zip files in a folder labeled "roms". You also want to download and transfer a zip called "gapps". There are the stock Google apps and you will flash it after flashing your rom.

OK now just reboot your phone, select reboot into recovery and it will restart and take you to twrp. Then you need to do a factory reset first (I do it twice) then wipe dalvik and cache (I do this before and after flashing the rom to be safe), then just hit install, navigate o the folder where you put the rom zip in and hit flash. Then flash the gapps zip once the rom is done flashing then wipe dalvik and cache again and voila you have a new rom on your phone! So just reboot the phone and youre golden.

Download titanium backup again and use that to restore all your apps, then SMS backup to restore texts and that's it. Good luck man hope this helped since it definitely would've helped me when I first started. Have fun and feel free to ask around if you have questions or just pm me and I'll try to help as best as I can.