SharePoint 2010 SP2 and DEC2013 CU upgrade

Hi

Currently we are planning for SharePoint 2010 upgrade to SP2 and DEC2013 CU in many of our farms. Could anyone suggest the best approch or path for the upgrade ?

Farm 1

SP2010 + Project server 2010

Farm 2

SP2010 + Language Packs + Office Web apps.

regards

Shan

SAK