Hi,
The other users are right CDG airport is the closest. We found that it is MUCH better to get a cab at the airport cost us roughly 50 or 60 euro to get to Disneyland Paris. If you get the metro and you have small kids and luggage it will be a nightmare....we did it once...the 50 euro for the cab was really worth it. All of the Hotels are fine near the resort however the food in some of them can be a bit ropey unless you are staying in one of the Disney themed ones like the Newport bay hotel (the best value and by far the best unless you are loaded and stay in the Main Dinneyland hotel). The buses are very very regular to Disneyland park.
March is a very good time of the year (It can be a bit cold but so what you will enjoy it) queues will be small unless it is Saturday or Sunday if you are there for those days be at the park really early.
Believe it or not get the yearly passport tickets (they cost a little more than the regular three or five day pass but the discounts on meals and merchandise MORE than make up the difference in cost can be up to 20% off on most items and meals, all you do is present the passport tickets as you pay and they will deduct the discount.
Yes get the trolly for the child you will need it. But be careful where you park it as there may be some people who somtimes take an unoccupied trolly dont worry if this happens just keep the reciept and if your trolly goes missing just bring the reciept back to the trolly point and you will be given one free of charge.
Don't bother eating food in the main themepark and it is usually only crap hotdogs etc. and cost a fortune. Try and pack a lunch snack to eat as you take a breather on one of the many seating areas, have a good dinner or meal in the Disney Village located just before you enter the themepark, you can enter and exit the park as often as you like.
Buy and extra groceries (minerals, chrisps, bread, cold meats etc. from the train station located just where you get the bus for the hotel.
There are some great events at Disneyland, checkout the all you can eat buffet meal (Ask at Information) it is a bit pricy but a lot of the characters come to the meals and go from table to table, this give a great oppertunity for your kids to meet and get their pictures with the characters without loads of others trying to cram in everyone gets a fair share...the character breakfast does the same...well worth it for the look an a small childs face when Mickey or Pluto come over and gives them a hug.....brill.
A small note though...and no offence to any French person reading this, the French do NOT understand the concept of queuing...you will see many jumping the queues and being very obnoxious..the Dutch are as bad..don't get annoyed as is the way they are.
Oh yes if you are travelling to Charles De Gaulle airport on the return leg give yourself loads of time because security is really tight and it can be a nightmare finding your way around.
Have a great break......say hi to Pluto for my son...