Original is the opposite of New. New is the opposite of Experienced. 
Useful is related to Helpful. Helpful is related to Guide. Guide is related to Sign. Initial is a type of Sign. 
Original <--Antonym--> New <--Antonym--> Experienced 
Useful <--RelatedTo--> Helpful <--RelatedTo--> Guide <--RelatedTo--> Sign <--IsA-- Initial 