I don't remember if Glaive has special features, IIRC only double damage against a charge? Otherwise Improved Trip or Improved Disarm, whichever may be relevant with Glaive.
If you are going to anticipate having a mount before 5th level, then Mounted Combat, so when you have Divine Mount, you'll have two "mounted" feats at 6th level.
Hold the Line -> defense against charge
Power Attack -> very melee classic
Power Lunge -> improves charge
Extra Smiting -> to make Smite Evil much more usable
any Divine feat -> you have plenty of turn attempts/day
Alluring/Trustworthy -> if you're the party diplomat
Resist Poison -> if you're the first-line
OF course, not all of them are optimal choice

. Plus, forgive me if I may not remember them well (requirements specially).