Hey.
I'm doing a sort of a "Shaman", and I want to use light armor and shield. However I can't seem to find ANY shields that are Unique in Vanilla.
So the best shield is a Glass shield? I wanted the Spellbreaker, but since I'm skilled in light armor, the Spellbreaker would 1) not block as efficently as a light armor and 2) skill me in heavy armor?
1) Blocking with heavy shield will be just as effective as blocking with light shield. The disadvantage of using heavy shield is just that it will contribute somewhat less Armor Rating to your armor.
2) Using a heavy shield does not level your heavy armor skill. Only helmet, armor, gauntlets and boots level your armor skill.
Do the perks in Light and Heavy armor increase the blocking amount, or is it only Shield wall and block skill that increase amount of damage blocked? How important is armor rating on a shield? Will the shield's armor rating increase overall armor or will the shields armor rating only increase block amount?
Perks in armor skill do not increase blocking amount. Only shield wall and block skill increase the amount of damage blocked.
Armor rating on a shield is only important to the armor rating armor part. Shield's armor rating increases overall armor, but it will not increase the block amount.
is it dumb to go for a heavy shield when using light armor?
No it's not dumb. Only advantage of light shield is that it's much lighter than heavy shields. Heavy shields block (slightly) better and do (a bit) more bash damage.