http://www.mobafire.com/league-of-legends/build/rune-tips-what-secondary-and-primary-means-and-more-24255
Read this and learn well young padawan.
It's definitely worth having more rune pages for different kinds of champions. I only have 3 but if I had the money I'd invest in the 7 rune page package.
So far as knowing if you will have enough, figure out which runes you want from the link and use a calculator to figure out how much you'll need at 20. I know when I was first building my rune set I tried to be very economical with my purchases.
Read this and learn well young padawan.
It's definitely worth having more rune pages for different kinds of champions. I only have 3 but if I had the money I'd invest in the 7 rune page package.
So far as knowing if you will have enough, figure out which runes you want from the link and use a calculator to figure out how much you'll need at 20. I know when I was first building my rune set I tried to be very economical with my purchases.

Thanks to GrandMasterD for my sig!
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IP: 12,000 and getting higher
I need to start thinking about runes soon. I guess my questions are:
1. Will I have enough at 21 to fill 2 runes pages?
2. I'd like to fill both. 1 for "melee" and 1 for caster. That being said: Are there MUST HAVES?
3. Is it worth working towards more rune pages?