how do i start syncing my files in CC

This is a two step process. First you need to activate sync for the catalog. You apparently have done that, that is why you now see a 'Pauze' button to pauze sync.

The second step is that you place those images you want to sync in a collection, and then enable sync for that collection. That will start the syncing. You can see that a collection is synced by the small lightning icon in front of its name.

What Exact version of LR are you using or what Sync feature are you asking about.

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