OK. so first, dont buy runes unless you know what you want. make a second account to specifically fuck around with runes. I made a huge mistake when i first started playing league, buying runes (thankfully the rune combiner was a thing then...) and i really got cheated out of IP. Look through the runes, see what intrigues you, then go look at pro players and see how they use those runes to better themselves. Thats what I did for the first little while before I got comfortable with making my own devilish concoctions...like 8% cdr on my top laners while having stupid damage, move speed and tankyness....(works really well on irelia, darius and fiora ;3) .