Long Jaw & Protruded Lower Lip? (photo)

Im 23 year old female I used to have a class 3 jaw protrusion.. I was wearing dental braces for 3 years..My teeth looks wonderful but my lower lip doesn`t & my jaw is too long for my face ..I don`t look good from front & side..will jaw surgery help me? how long do I have to wait b4 I see results ? & how succefful the operation is?how much does it cost?& whats are the complication?Will it make my hanging lip looks better? & are there too many scars afeter surgery? sorry for too many questions

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