Hi Unnivat,
There is a TGV Train from
Gare Montparnasse within Paris that leaves at 14:05 each day to Laval, taking 1 hour 31 minutes for the journey. Cost for tickets purchased ahead of time are around 24€.
To get to
Gare Montparnasse, take the
RER B train from CDG Airport to Paris, getting off at Denfert Rochereau station. From this station, transfer to the Metro Line 6 direction Charles de Gaulle Etoile (use the same
billet Ile-de-France you used for the RER B). 3 stations along the line will be station: Montparnasse Bienvenue. Descend the Metro there and walk upstairs to the Grandes Lignes train platforms (see the
photos of Gare Montparnasse for a better idea).
Please see my articles on
buying TGV Tickets for help on that if you're coming from outside of Europe. If you're coming from within Europe, you may wish to use
TGV-Europe.com for buying your tickets.
Good luck and let me know if you have any other questions,
Ben