I collected information about the cost of meals, transport, presents,.. in internet (official webpages, blogs based on people experience,.) in order to prepare in advance the travel budget. At the end of the travel we got money left!
Disney - Paris
To visit some of the important places of Paris, we used a city map. and we got it! we visited in one day: eiffel tower, trocadero, arco de triunfo, eliseos, ponpadour, louvre,...
to visit Paris from Eurodisney using the train, I found the ticket sell point and bought ticket to Paris and to use there the subway an other public transports.
Also I selected the platform and the correct train.