The Open Return rail fare, from Norwich to Liverpool Street is currently �71.00. If you can travel off-peak, the Saver Return fare is �41.00. There might be cheaper advance purchase fares available, but these can be hard to get around holiday periods. Additionally, you should be aware that rail services between Norwich and London are often disrupted by engineering works over the Easter period.
Car parking at Norwich station is �8 per day.
My preferred option would probably be to drive to Ebbsfleet station to board a Eurostar train from there. The AA website gives the distance, from Norwich, as around 120 miles with about 2� hours driving time. Parking costs �11.50 per day:
http://www.eurostar.com/UK/uk/leisure/travel_i nformation/at_the_station/terminals/ebbsfleet_ international.jsp
A further alternative is to travel to Luton airport (about 100 miles from Norwich, 2� hours driving time) and take an easyJet flight to Paris CDG. For some random dates I've just checked, fares are in the range �23.61 to �31.61 each way,
including taxes and charges. There are 4 flights per day in each direction
http://www.easyjet.com
Car parking at Luton is �9 per day if you use the long stay car park.
Travel from CDG airport, into central Paris, is cheap and easy using RER Line B.
Paris has such a good public transport system that it doesn't really matter which area of the city you stay in. However, the Latin Quarter is full of cheap eating places (with the price of a 3 course meal starting from around �10) and handy for access to many of the main tourist attractions. The hotel recommended by Wingnut is on the edge of the Latin Quarter, so it's well