Open iTunes on your pc.Connect ipad. click on device icon cursor at left to expand the content folder and select music to see whats on your pad. Now click the ipad icon again so that the summary page displays. navigate using the menu at the top of this page to the Music Tab. Select sync Music.
Select - Selected Albums and playlists. Tick the music you want to sync, then click sync button in bottom corner of screen.
On your iPads Hmepage locate and select the music App. Select a song and then tap the play button.
http://support.apple.com/manuals/#ipad
Select your manual and when it displays, move your finger around at the top of the screen-a bar will appear with an option to download to iBooks, tap it so your manual is permanently on your device.
If you need further help in tailoring your sync experience then see here
https://discussions.apple.com/thread/3884559?tstart=0
Gives a detailed look at how to tailor your music syncing experience.
Also you can dowload to your music App library direct by purchasing music on iTunes - purchased music is automatically added to your library. When finished open Music App, select your song and hit play.
The same is true for Movies, but use the Video App. Books, Tones, Podcasts, etc, just see the manual for details.