What the others said here are pretty much spot on ,( just depends on how many tools you have available and skills ) but first , and only first you need to sand blast this area to see how much unseen repair is needed !
Usually more then meets the eye

Metal shaping isn't rocket science just common sense really , you can also use small amounts of heat with a torch to move metal with hammer and dolly too . But having lots and lots of tools make metal work much easier , its why I had to sell my 37 Ford humpback 3 years back because I ran out of money buying TOOLS and parts to build my rod .