PGN Help!!???! Need your comments!

I refuse to believe that you can't teach an old dog new tricks.  I recently purchased an iPad2 and have loaded several chess apps (including chess.com!).  I need your help please.  I really want to use the PGN database feature in my tchess pro app.  I have never tried to find, load, use PGN files before.  Naturally I am looking to obtain games I'm studying in books to use the iPad2 as my analysis board for greater comfort and flexibility. 

If you have experience using PGN files, know where I can find the PGNs to famous games, are willing to give me instructions on how to get these files into my iPad2 so I can use them with tchess pro I would greatly appreciate it.

I suspect your comments will not only help me, but also any other readers of my posts.  Thank you.  Please teach this old dog a new trick!

Merry Christmas,

Zac