AW: [TUTORIAL] Install Gaaps for Cyanogenmod7, Market and Google apps.
Some ROMs have their own recommended GApps so check first in your ROMs thread. If not, you can just browse goo.im for the latest GApps. Make sure, it's the right package for your Android version. Jb = jellybean, gb = gingerbread. For the flashing you can follow the guide above.
Sent from my Nexus 4 using xda app-developers app