|Viel vs. Viele|
Viel is an ADVERB (and as such never has endings) meaning "much" and is used with non-countable nouns such as Milch, Zeit, Geld, Arbeit, etc., regardless of GENDER:
Ich habe nicht viel Zeit.Viel can also be the precipitor of an adjectival noun phrase:
In Afrika hat Erich viel Gutes getan.
Viele is a (plural) adjective of indefinite number meaning "many", and as such may have appropriate PLURAL endings (e or en):
Viele Arbeiter wollen die Firma verlassen.
There are some expressions which consist of viel- plus adective endings. In these cases, viel acts as an adjectival noun, and is therefore not followed by a noun:
Vieles darf nicht gesagt werden.