The micro SD card is great for storing your media files: photos, movies, music, documents. Use a file browser app to COPY the files to the SD card, restart the phone, verify that the files work on the SD card, delete the old files from internal storage.
Leave the apps and games on the internal storage, this is where they are best.
Check your settings for your camera app. Some apps will let you set the save folder to the SD card.
Check the settings in apps that use lots of data space (maps, GPS, etc). Some let you pick the SD card for the data storage.