You`ll have a blast. Dress accordingly; Europe is a bit cold at the mo (though the resort was built for cold and wet as well as sun)
2 days will be ample to see everything Disneyland Parc has to offer at a lesiurely pace. A day at the studios will be fine too. Any more time you may want to check out Disney Village or the fantastic mod hotels around the lake (and Disneyland Hotel at the entrance - all are walkable)
DO NOT miss Phantom Manor, BTM, PotC, iasw, Peter Pans Flight, Buzz or Space Mountain 2 at DL, or the ToT, Crush's Coaster, Cinemagique, Armageddon or RnRC (different visuals and theme to DHS) at the studios.
Try not to miss Indiana Jones Temple of Peril, Pinochios Daring Journey, Snow Whites Adventures at DL, or Animagique at WDSP. WOrthy of time also are Adventure Isle, Storybookland Canal and Casey Jr, Moteurs Action (DHS version is quite a bit different now) and the backlot tram tour.
Star Tours is the same as DHS (even in layout) apart from the language, and HISTA Is the same as the US versions but with English on headphones.
Make sure you take in all the details of Disneyland Parc. You`ll see why it cost so much!
Feel free to ask anything else.