Fire safety door & load bearing walls

[Maria Illilani]

Hi all. I'm looking to get a metal fire door properly installed coming from my garage to the house. Not sure what the name of the specialist who can do that is so please enlighten me lol. 

Also looking for someone who can determine if walls are load bearing because I'd like to open up my galley kitchen. I read that I'd need a structural engineer to verify. Is that correct? Thanks in advance!