I want to put as much into health and stamina as possible, obviously, so what is the least amount of point I should sink into magicka for a warrior who wants to summon, and does not enchant?

300, after all perks you want it's quite deadly with a necro mage, let me guess you saw me commenting

300? Well, there goes that idea. There is no way I am sinking that many points into magicka with a warrior. Pure warrior it is, then. Thanks.