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HELP please, how can i know that what tests are required for a new product?

dear all
Could you let me know asnwers of following questions to understand validation better ;

1-what tests are going to be included or excluded? How i can know them if a new product will be validated (granulation,tablletting and coating processes)?

2-What tests are going to be required ? Where i can find required tests for validation (granulation, tabletting and coating processes)?

3-how can i decide sampling frequency and amount of sampling? if i take samples more than i required it can be a deviation?

4-we are performing blend uniformity tests in granulation step but our acceptance criteria are written as “only for information”. Our costumer doesnt want to accept these criteria, how can i convince them about this criteria? (there is no deviation or no problem occurred during validation)

please let me know answers of these questions for solid drug production.

thx in advance
Gokhan