hi , is there any way/where to see what my total magika and other stats are? and do these stats stack? like if wearing an increase magika robe and a mage circlet that increases magic. or say 2 different pieces of armor that both raise archery damage? if a certain spell says i need 275 magika to cast , how can i look to see if i have that amount of magika? thanks

You can check stats under perks menu. Skills and stats show in green are the ones boosted with magical items or potions.