Pretty easy to go from a place to another here in Paris.Use Metro, the local subway, should bring you anywhere at less than 5 min by walk of the spot you run after ;). You can buy several kind of passes but avoid single trip tickets, tempt to be costly (1,5€/each). More information on www.ratp.fr where you can also figure out your trips and metro line changes.
Little maps are available for free at Metro offices, ask for them! Also, there is usually a local district map out of each metro station. Be careful,

Metro closes at 1am (week days) and 2am (week ends).
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Buses are cool, they are much slower than Metro but you can see what's up outside! They work with the same tickets/passes than the Metro. Some lines are working all night long...not the safest idea...
Velibs are bikes that you can rent for a day. They don't cost much (2/3€per day) and are confortable. Watch out before you pick one, some might be broken...
Finally taxi cabs. They aren't expensive in Paris, avoid rush hours like 5 to 7pm or 8 to 9am when you may get stucked on traficjam.
Labels: aide, bus, help, metro, paris, taxi, transports