You say, "What type/kind of books interest you?" And you say it, "Qué tipo/clase de libros te interesa?"
Estoy interesado
English: I like books. Spanish: Me gusta leer libros.
El Libro= The book Libros= Books
Me interesa comprar esto
In Spanish "the books for our class" would translate to "los libros para nuestra clase".
dos libros
un cómic
libros scolasticos
"Which kind of books is..." The verb has to agree with kind in number. It is a bit odd sounding to say "kind of books"...not wrong just odd. It seems to emphasize that you expect more than one type in the kind. You more often hear "Which kind of book is..."
cierre sus libros
Libros de ciencia
You can say "Leer libros".