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Which is the vertebrate class that is considered the first entirely terrestrial?

The first entirely terrrestrial vertebrate class, totally independent from the aquatic habitat, is the reptile class.

Comparing to amphibians what is an example of evolutionary novelty present in reptiles against the loss of water through the skin?

The reptile skin is keratinized and impermeable to water while the amphibian skin is permeable. The skin impermeability made impossible the cutaneous gas exchange performed by amphibians and in reptiles the respiration became dependent on internal organs like airways and lungs.

What are examples of a carnivorous and a herbivorous reptile?

Snakes are carnivorous reptiles. Iguanas are herbivorous reptiles.