When you are starting out you need only really need 2 general purpose rune pages, these can cover the role of caster dps, physical dps, tank, support, all that stuff.
RED: Both Armor pen and Magic pen
YELLOW: Health/Lvl OR Dodge
BLUE: MR, CDR, CDR/Lvl
QUINT: FLAT HP
Get both reds which you will use in 1 of the pages each, and 1 of the other colors which you will use in both pages.
Later on you can worry about getting more precise rune pages, but its best to start off with rune pages that you can comfortably use on every champion in the game, and this setup provides that.