I need some help
 

I am traveling alone and will be flying into Orly from Berlin on May 5. I want to go on to Lyon. How would I go from Orly to the Gare de Lyon to get the train? Is there a bus or would I have to take the RER? I'd appreciate any suggestions.

From Orly Airport, you can take the Air France Buses or the Orly Rail Train, and stop at Gare de Lyon

Cigale-

The Air France shuttle line that goes direct to Gare de Lyon from CDG (line #4) does NOT go through Orly. To get to Gare de Lyon from Orly, you can take the Orlyval-plus RER Line B to Chatelet-Les Halles, and from Chatelet, take line 14 to Gare de Lyon. It might be easier just to take a taxi-which will run you between 30-40 Euro. from Orly, depending on time of day.
Other

?? I found it on line?
From the airports:
From Orly Airport, you can take the Air France Buses or the Orly Rail Train, and stop at Gare de Lyon.
From Roissy Charles de Gaulle Airport, take the RER B, direction Paris, and change at Chatelet les Halles, take RER A, direction Marne la Vallée Chessy or Boissy saint Leger, and get out at Gare de Lyon.

Girlspy, you're right !!!