I'm assuming you meant you've turned on iTunes Match on your Mac. With iTunes Match turned on, all your music is sent to the cloud. This is either an "ON" or "OFF" proposition. Once your music is in the cloud, all your iOS devices can access these from anywhere. However, on the iOS device you have to enable iTunes Match through settings.
If you are wanting to manually sync music from iTunes to your iOS device, then there is very little reason to use iTunes Match other than to upgrade your digital music to the higher bit rates from Apple.