1 Month in Lisbon - What Pass to Get?

Hello - we will be staying in Portugal (Belem) for 1 month (November, 2011) and am confused as to what transit pass to get. We plan to do a lot of traveling around the city, and so will depend much on metros, buses, trolleys, etc... I am not sure what pass to get. We wanted to get the monthly pass. First, how much is it because the Carris site is a little confusing? Also I was told by a friend in Europe that there is a 12 euro one-time fee making the total cost 42 euro, and that the montly pass may take a day or 2 to be issued. Is this correct? I also know about the "zapping" option. Does zapping sound practical for a 1-month stay that will involve heavy travelling? Thanks for any suggestions and help. I get so confused by the Carris site!!

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