Although the journey itself is only 10 mins, they are not as frequent as you might expect.
Take a look at this link & this will give you all the info on how you check times (& fares)
https://www.seat61.com/Europe-train-travel.htm Also, if flying in, it's risky to pre book a train as you never know if your flight might be delayed etc so you end up with a choice of pre booking a specific train & risk missing your train, or paying full flexible fare.
The TGV is quite pricey (particularly if not pre booked), so if you're in a large group, you'll probably be cheaper & easier just booking a large cab/chauffeur service.
If you do choose the TGV, there's no point even going to your seats as it's such a short journey & the trains are generally busy, so you'll just end up stood by the doors as no time to drag kids & babies to the seats past everyone else.