install Rom Manager off the play store. Then inside the app install CWM. Reboot then from the app again reboot into recovery. From there you can make a nandroid backup of your stock rom. Also from recovery you can install any ROMs you have put on your SD card. I like BrokenOut but id DOES have some bugs that have yet to be addressed so you might want to just go with stock ZVA debloated. You can always switch back so experimant.
One more app I will DEFINITELY reccomend is Rom Toolbox Pro. Pay the 4.99 for it as it seriously combines like twenty apps into one. It has a root explorer, an app manager, an app permission manager and startup manager, scripter and terminal emulater, ad blocker, Apps2SD manager, a rebooter, CPU (with profiles) and kernel controls, build.prop tweaks and editor, memory manager editor, SD speed booster, AND it lets you edit your system fonts, boot animations and Icons. Seriously its the best $4.99 Ive ever spent for android.