want demand letter and to sue for defective airbags

I'm looking for an experienced Freelancer to help write a demand letter and pursue legal action against a company for providing me with a defective airbag. Although I do not currently have evidence indicating the airbag was defective, the impact has not yet been documented. In addition, I would like to include a payment claim within the demand letter. I am seeking capable services to ensure that justice is done and that I receive proper compensation.
I’ve become injured when my airbags didn’t come out during a motor vehicle accident. I’m now permanently disabled. I want a lawyer to help me sue the car manufacturer, airbag company, and the car dealer from where I purchase the vehicle. If you can represent me in person should this go to court, that would be ideal instead of me being pro se with no lawyer present to help me know what to say.