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Do i need a real estate attorney and inspector to buy a new home in Southern CA? - home warranty recommendations

I am about to sign a contract with a builder of houses, the house is located in Riverside, CA. I heard a comment that needs to look only a realtor and check my contract and the role of the trustee, a lawyer. Is that true? somehow with all the online research I've done, I'm not so convincing that idea. This is the first time you buy a house, so I have no idea who advise better.please. and if you are a real estate lawyer, please give me some recommendations in Riverside, California and throughout the city. It would be nice if I could also have an idea of the size of the firm to give the lawyer.
He also told me that it is not necessary to hire a building inspector is the door to new and comes with warranty.again'm not very persuasive. Therefore you need more advice and the opinion of the people, and the recommendation of the inspector as well as at home. Please let me know, also responsible for monitoring, if possible. Thank you!