tl;dr for lifesteal and spellvampawp wrote:
suffice to say I still have no idea how a bunch of stuff works in this game (eg lifesteal)
lifesteal - heal for a percentage when you AUTOATTACK
spellvamp - heal for a percentage when you use an ABILITY
it's a bit more complicated because some abilities also apply lifesteal, best to just read this: http://leagueoflegends.wikia.com/wiki/O ... cal_Damage