my car was stolen then burnedand my insurence comany denied my claim how do i go about filing a lawsuite

The action you take will depend on the value of your car.  If it is under $5000 you can bring a claim against your insurance comany in small claims court.  If it is above that amount, you should hire an attorney who will bring a claim.  bear in mind, your claim is only valid to the extent your insruance contract provides coverage and the reason for thier denial must be analyzed.