If you didn't know, most of the basic runes ip prices were changed drastically to help new players spend less of their hard earned ip to buy runes and more to buy champions.
Need to have runes
-9 Flat AD Marks ( Red )
-9 Flat armor seals ( Yellow )
-3 Ability Power Quints
-3 Atk speed Quints
Marks
You really need the Flat AD marks, they help you cs and give you a vital boost to your autos earlier in the game. Take these on any AD champions.
On the flip side, if you can afford it, Flat magic penetration marks are standard for mages.
Once you start getting more involved in the game and want to take on a support role. Consider flat armor marks for tanky supports like Braum.
Seals
Flat armor seals is the way to go. I would recommend taking these until you feel like you can play well enough without the armor then for mages take 9 scaling health per level.
Glyphs
Glyphs are the most versatile of runes, what I usually run on ad champions, is 6 scaling cd @ 18 and 3 flat MR. If you're a beginner and safety comes first, consider buying just 9 flat MR glyphs. Or you can mix and match some scaling MR and flat MR.
Quints
For ad champions, atk speed is the meta and flat ability power for mages. Once you start picking up on some champs, movement speed quints is probably your next best unique quint.