You have come to the right site to get your questions answered. There are many people here that will help you in all aspects of your build.
There are many companies that you can choose from and some are supporters of this site.
My Cobra is a Factory Five Racing (
http://www.factoryfive.com/) that used a Mustang donor for the suspension and drive train. They also have a kit that gives you all the parts except the engine, transmission, wheels and tires. Just depends on how much you want to spend in dollars vs. sweat.
I am sure many will follow with other choices for your education.
Have fun with your build and send us lots of progress pictures!
Steve