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The indefinite articles a and an are used to modify singular nouns. When using plural nouns, these two articles are unnecessary. Plural nouns can take either a definite article or no article.

The definite article is the word. It precedes a noun when referring to something specific (ie definite).

Example; The phone is ringing.

The definite article is the word the. It precedes a noun when something specific (i.e., definite) is being referred to.

Example; The phone is ringing.

Indefinite articles, on the other hand, are used before nouns that are nonspecific within their class.

Example: I bumped into a lady on the sidewalk.

We do not know from this statement who this lady is specifically. We only generally know that the person is a woman.
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Plural nouns can be used with the definite article or no article at all; to use an indefinite article would be incorrect.
Incorrect                 I have a books in my locker.
correct                        I have books in my locker.
correct                    I have the books in my locker.

It is also unnecessary to use an indefinite article if there is an adjective in front of a plural noun.