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Much and many are determiners. Much is used with uncountable nouns and many is used with plural nouns:

			There isn't much sugar.
			Do you have many relations in America?

Much and many are usually used in negative sentences and questions:

			We didn't have much luck today.
			Have you got much more work to do?
			There aren't many hotels in this town.
			Do you know many people around here?

Much is not usually used in affirmative sentences. For these, we prefer a lot of or lots of:

			He has got a lot of money (NOT much money)
			There is a lot of rain coming later today (NOT much rain)

Many can be used in affirmative sentences, but a lot of or lots of is more common in spoken English:

			There are many ways to approach this (or lots of ways)
			Many people are living below the poverty line (or lots of people)

Much can be used in affirmative sentences when it is preceded by so, too or as:

			There is so much work to be done.
			I think that he has got too much responsibility.
			Drink as much water as possible during the race.

More information about much and many:

http://www.edufind.com/english/grammar/Determiners7a.cfm