I would warn you that, if your saying you've got 15 minutes from the time you land, then you probably won't make it. It takes a little while for the plane to taxi over to T3 after landing, then you have to get on a little bus to take you over to the terminal building. Then you go through immigration which takes a few minutes, then you have to wait for your luggage!!
Having said that, the VEA shuttle is then very easy to find outside T3 - just turn right on exiting the arrivals hall and walk about 200 yards.
Here is a map of T3 to give you an idea of what I'm talking about.
To get to the TGV station, carry on walking past the VEA stop, past the end of the building, through the tunnel, cross the road - to the airport shuttle stops! Take the No. 5 bus over to T2, and the Gare TGV is about the fourth stop.
I'm honestly not sure you will get into the park whatever mode of transport you take - the
Disneyland Park closes at 7 pm tomorrow. So if you get there and know you're not going to make it into the park that evening, I would go for the VEA as the (slightly) cheaper and (definitely) easier option
