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I would probably do all the rough metal work first - because once you blast it, you'll want to most likely epoxy primer it as fast as possible. You can put filler over quality epoxy primer (is usually the recommended way these days), but you don't want to be welding and having to redo all the primer areas.
Brazed patches - are the nemesis of all good body metal workers . . . anything with brass on it needs to go. Hopefully you can grind all the brass out - you may need patch panels that are TIG welded back in.
I prefer TIG or traditional oxy/acet for all body welding as the welds are not brittle like MIG. The most important thing with blasting is that the vendor really knows sheet metal and doesn't warp any of your panels. Take time to find the right supplier and checkout their work.