I mean are there some sort of duties that freemasons have to perform, such as community help, or just among the organization itself?
OK, gotchya.
Actually, among a Freemason's duties to mankind, charity is especially important. A Mason is reminded that ALL men, not just fellow Masons, are his brothers.
A Mason also has obligations to his Brother Masons, that include respect for his Brother's private conversations with him, respect for the chastity of his Brother's wife, mother, sisters, and daughters, and a duty to never cheat, steal from, or defraud a Brother Mason. A Mason is also obligated to care for the widows and orphans of his deceased Brothers.
Some of Freemasonry's detractors have a problem with it for religious reasons. Freemasonry only requires that a man believe in a Supreme Being... "God", if you will. Beyond that, a man's perception of God, and how he is led to worship is between the individual Mason and his God. Some people feel that Freemasonry is anti-Christian because the fraternity does not require the belief in, and worship of Jesus Christ. We do not disagree (as Masons) with one another over matters of religion or politics, because the discussion of those two subjects is forbidden in the Lodge.
I hope this helps answer your question.