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Enough means "sufficient", or"as much or many (of something) as necessary".

Too means "more than enough" or "more than is needed or wanted".

Enough comes after adjectives and adverbs:

It isn't hot enough to go for a swim.
We're not moving quickly enough.

Enough comes before nouns:

We have enough time.
There isn't enough flour to make the cake.

Too comes before adjectives and adverbs:

It's too cold to go for a swim.
You're driving too fast.

When we put too before nouns, it goes in the expressions too much and too many. Too much is used before uncountable nouns. Too many is used before countable nouns (See more about): countable and uncountable nouns:

You put too much sugar in my coffee.
There is too much poverty in the world.
There are too many people to fit in the car.

More information about too and enough:

http://www.edufind.com/english/grammar/ADVERBS7.cfm