Job Offer Junior Architect

Hello guys,
I am an Architect registered in India with one year of professional experience. I have been offered 450 (all inclusive) BHD by an architectural firm based in Manama. They offered me this job because of my BIM skills. They were not getting any candidate with the required skills. I want to know few things
• Is 450 BHD good for Junior Architect?
• Can I survive in Manama with 450 BHD, considering I am a single vegetarian guy who doesn't smoke or drink?
• Do I need to submit my Passport to the employer?
• While leaving the country, Do I need an exit visa?

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You can survive in that money.  You only need to give your passport to your employer for visa stamping but he cannot keep it.  No, you don't need exit visa.