Or just go straight fighter. You don`t have to multiclass every character.
(I will only present some options, I don`t like concentrating on just one possiblity)
Feats to consider:
Power Attack - Cleave / Improved Bull Rush (greater cleave is okay, but that depends on the typical enemies you face - many low hit points enemies can be well elimantet with these feats.)
Sunder is sometimes good, but it hurts if you destroy magic weapons.
Expertise - Improved Disarm / Improved Trip - Knockdown
Both feats are very useful if you encounter many humanoid enemies. Against creatures not using weapons, or creautes greater than medium size, these aren`t so useful. (But knockdown gives high level fighters a good chance to at least try some trips, even if there is no great chance for success)
Expertise is useful if you have easy time to hit your opponent, but he inflicts much to much damage if he can hit you. (and it might compensate for the lack of your shield)
Improved Initiative: If you don`t have a high dex, but want to get in combat quickly (dropping foes as fast as possible - it is also good if you are able to disarm some of them early in combat. At least it will cost them time, at best they might really suffer from it)
Weapon Focus - Weapon Specialisation:
Weapons best for it are Bastard Sword (as Medium size weapons, but only if you get the exotic weapon profiency) or Greatsword.
If you plan on switching your weapons during fight, depending on your foes, these feats are not the best ones.
If you go for Ambidexterity/Two Weapon Fighting (if you multiclass with Ranger, as an example), get the Shield Expert feat. As an offhand weapon you can use your shield (Shield of Bashing or Shield Spikes), as your primary weapon a Bastard Sword (you will be as good or even better as with a double weapon).
But if you decide to go for double weapons, Weapon Focus and Weapon Specialisation might be some great ideas. (I believe, as a double weapon together with Improved Trip/Disarm the Dire Flail is the best weapon, but together with Improved Critical the Double Bladed Sword - good idea probably for Elven Fighters - can also be very powerful.)
I think one of the most important thing is to remember to have the right stats to get the desired feat chains.
With 25 point-buy (that is the most common in our gaming group`s D20 campaigns), the stats are most likely to be:
Str15, Dex13, Con12/13, Int14/13; Wis10; Cha8
(without racial modifiers.)
I currently play a Ranger3/Fighte3 that started with:
Str14, Dex14; Con13(14); Int14; Wis12, Cha8.
(And the low Strength hurts - but not the opponents

)