How do I add a Playlist to my Ipod in Itunes 12?

1. Connect your iPod
2. Click on the iPod icon (top left of screen)
3. Click on Music (under Settings, not On My Device) in the sidebar
4. Make sure that the Sync Music checkbox and the Selected playlists, artists, albums and genres radio button are selected.
5. You'll then see a list of all the playlists and playlists in your library. Check those that you want to sync, then click Apply (bottom right of screen).

Yes, the screen layout is different for Podcasts - should look like this:

A lot of the screens and UI operations for iDevice management and syncing did change between 11 and 12 - for the better, I think, but may take a little getting used to ...

Open itunes, connect ipod, select what you want, sync.

Nothing has changed in this regard from previous versions.

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iPod nano - Syncing - Apple Support