PSA: Dingus Shield Is Bad

Start with 2 Rejuv. Beads and 4 pots instead.

Or, start 3 Rejuv. Beads and 1 pot, and throw in a couple armor quints. On bruisers you'll have about 18 regen per 5 from the beads alone by level 8 or so. That's 3 times more than the shield! You just need to be sure that you're tanky enough to get away with it.

To explain the maths, Doran's Shield will always only give 6 hp regen per 5, and the 8 damage it blocks is considered BEFORE armor is factored in. So it'll actually be blocking about 5 damage per single target thing, and only 4 or 3 later on when you have more armor.

So do the rejuv. bead thing, or start cloth+4 because it at least gets you some damage reduction from minions as well early, and it can also help you rush Tabi which is really good.

Free Protip: Getting something other than MR (like AP, mana or cdr) for glyphs means that the MR you'll get from items will be more effective and it will be more worthwhile to build them. There are good items and champion abilities that scale off of your armor, but there is definitely such a thing as too much MR.