In PvE, holy paladins are fairly restricted in which glyphs to get - simply because some glyphs are just so much more powerful or useful than others. The common set up is:
Players normally choose between Glyph of Holy Light or Glyph of Flash of Light depentant on which is their main spell: [Holy Light] or [Flash of Light]. A lot of paladins will however get Glyph of Holy Light regardless. Due to the mana effectiency of [Flash of Light], some FoL-type paladins will get Glyph of Seal of Light instead as mana is less of a problem then for HL-type paladins.
The third minor glyph slot however is up to your own personal opinions. None of the three listed present a clear advantage over the other so it up to personal tastes.
[Glyph of Hammer of Wrath] really makes a difference on boss fights. By the time you're getting low on mana, you suddenly have a free, hard-hitting, oft-critting attack.
My personal picks are Judgement, Vengeance, and HoW unless I have enough expertise rating on items, then Avenging Wrath. Although, I have a personal liking for [Glyph of Divine Storm], essential for AOE grinding.
Minor Glyphs
Paladins don't have many good choices for Minor Glyphs. The ones that are musts for Ret Pallys are: