Use many with plural countable nouns and much with uncountable nouns. Information and advice are usually uncountable: some information, a piece of advice.
Practical examples
How many tickets do we need?
كم تذكرة نحتاج؟
How much time do you have?
كم لديك من الوقت؟
I need some information.
أحتاج إلى بعض المعلومات.