Disneyland and travelling in paris?

Hi there, a group of us are travelling to disneyland paris for 3 days and plan to spend one day in paris and the other day at disneyland. We are staying quite close to disneyland in Marne la vallee, what i what to ask is does anyone know how the travel system works, how much is it for a day travelcard or would it... show more Hi there, a group of us are travelling to disneyland paris for 3 days and plan to spend one day in paris and the other day at disneyland. We are staying quite close to disneyland in Marne la vallee, what i what to ask is does anyone know how the travel system works, how much is it for a day travelcard or would it work out be better to buy a carnet (10 single tickets) as we only plan to go into the city once during our stay. Any tips would be greatly appreciated, especially money saving tips. Also tips on where to visit in paris as well as tips about disneyland itself.

Thanks in advance
Update: Plus how much do the main attractions cost...eg. Eiffel...and are the queues very long.
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