Standard AD and AP rune pages?

Scaling health or flat armor seals, scaling or flat MR glyphs on both pages, so you pay less for them.

On AD: Flat AD or APen marks, and flat AD or AS quints, all combinations work really.

On AP: MPen or hybrid penetration marks (if you often play something like Kennen), flat AP quints.

Whatever you decide to do, it is IMO very important for a beginner to take defensive seals and glyphs, you will see many pros play without them, but early on very offensive runepage will make unnecessarily hard for you to win games consistently, because you are not as good as them in avoiding bad trades.

AD -> AD reds (or attack speed), armor yellows, MR blues, AD quints OR 1 lifesteal quint.

AP -> magic pen reds, scaling health yellows OR armor OR mana regen, AP blues OR magic res blues, AP quints, OR movement speed quints.

true generic AD -> AD/armor/MR/AD true generic AP -> MPen/scaling health/AP/ Choice more Mpen or early AP.

i personally have several sets of each.

for ADC i use mixed AD + AS reds/Armor yellow/MR blues/AD quints for AP i have many sets

AP MS -> Mpen reds / mana regen yellows / AP blues / Movement speed quints AP VS AP -> Mpen reds / scaling health / MR blues / AP quints AP VS AD -> Mpen reds / Scaling health / AP blues / Armor OR more AP

Just remember that certain ADCs like Corki and Ezreal work better with hybrid pen runes since they do a combo of AD and AP damage. So you want a rune page for hybrid champs.