A Dual Shield fighter is possible, but is restrictive and fiddly.
First, when making high-concept stuff like this, it's critical to be aware of potential pitfalls of your character. Take a look at este guia to get a sense of the traps involved.
To realize this, my first preference would be to refluff some more "standard" version of the fighter into a double-shield fighter. Holding two shields does nada for your defensive capabilities. But, with that said, the feats of superior proficiency "spiked shield" and midnight blade student make dual strike quite... interesting. You can "shield bash" two people a turn. Of course, the problem is in good positioning and actually doing damage. While entertaining, the dual strike fighter tends to be severely "one-trick pony"-ized.
As a first time player, I would instead look towards the Cavaleiro-variant of fighter. There's less "fiddly" stuff, and the idea of a heavy shield + spiked shield can serve you quite well. It's also very muito hard to go wrong with Dwarven Weapon Training, with a Heavy shield and "gauntlet axe" (if you want to fit your personal style) and just say the "gauntlet axe" is a razor-sharp shield.
Two shields as "important" only really comes into play with the Snapping Tetsudo Paragon Path, a relatively uninspiring choice, unfortunately. To be fair, Dragon Magazine 385 has a significant number of "shield-as-weapon" choices, but few of them require dois shields. All that being said, I would still go with knight + dwarven weapon training, and either pretend a hammer or an axe was a shield, depending if you want to be bashy or slicy. The mechanics fit better, and the thematic imagery can be just as vivid.
