Brian has just bought a '62 Tbird that has been sitting for 20 years. It did not come with keys, so he cannot open the trunk, or start the car. He has tried to get the back seat out of the car to get into the trunk to unbolt that latch, using the methods we use for Squarebirds. But he cannot get the seat to pop loose. I have researched some 25 pages of posts for the Bulletbirds, and came up with a couple of links that might help. That seat should just pop out of the clips holding it in place, like the Squarebirds do. Here they are. First of all if you have not read the instructions on how to get the back seat and seat back out of a Squarebird, check this out. It might help. This is right out of the TRL.
If this does not help, than hopefully a Bulletbird owner can chime in here. Once you get the seat and seat back out, you should be able to reach into the back following the instructions in the first link.
As for the ignition switch, once you get it out, you should be able to take it to a locksmith and see if they can make a key for it. But if I am wrong about that, someone chime in. Before doing any electrical work, removing that ignition switch, etc, take one of the battery cables off the post.
All of our Tbird parts houses have shop manuals for these Tbirds. The listings for our Tbird Parts houses is found in the Advertisements Forum. The Bird House, the Bird Nest, Mac's, and many more all have them for the Bulletbird. Take a look at the manuals available for the Bulletbird because you will need more than just the shop manual. The electrical wiring diagrams are all in the TRL, which link is always right below my signature element.
Once you get either a new ignition switch, or a key made for the present one, then you can see if the car will turn over. Depending on that, then you will have a good idea of what to work on first. When you start troubleshooting things, it helps us if you post pictures. In my Welcome to you, I told you how to go about posting pix on this Forum. Good luck with your project of bring this ole gal back to life. The guys will do all they can to help you, but to help them, take one project at a time, give us pix so we know what you are looking at and seeing, so we can help you diagnose what needs to be done to fix that problem.