Well, if I were a hobgoblin warlord, my basic war strategy for my full army would be to put my goblin shock troop infantry (Warrior 1s) up front in the middle. They would carry spears and basically be there to take a lot of casualties from enemy archers, and to suck up the enemy arrows and bolts. They would be expected to rout/break and run away before reaching the main enemy force. If they did not break, they would then die quickly on the enemy swords and spears (or, run away after a few died on the enemy swords…)
The flanks of my army would be made up of elite goblin warriors trained to ride wargs. Give them a level of fighter instead of warrior. They are there to harass the enemy front lines, take down any enemy missile troops or spellcasters, or maybe even flank the enemy. They are trained and disciplined and have a much better morale than the goblin shock troops.
Behind the goblin cannon fodder, I mean, shock troops, I would have my elite hobgoblin infantry – armored with pikes if facing cavalry, swords if not. On each side of the elite hobgoblin troops would be groups of bugbears as heavy infantry. Once the hobgoblin warriors engage the main enemy troops, the bugbears then try to rush around the sides of the enemy forces to enclose them - the heavy axes and greatswords that the bugbears use will then smash into the enemy troops as their shields are forward fending off the hobgoblins (think of the hobgoblins as the horizontal line in a capital H, with the bugbears moving from the bottom to the top) They will also engage any second line of defense behind the initial row of defenders and try to create havoc in the lines.
The worg riders either continue to harass enemy missile troops, or else try their own flanking maneuvers to try and completely box in the enemy. They also stand ready to run down any opponents that straggle away/rout/break.
Behind the wargs on the flanks, I would have specialty hobgoblins – archers and skirmishing type troops. Some skirmishers to try and take down a spellcaster with a well placed javelin. Some might be mounted on horses to try and make lightning strikes on enemy commanders or spellcasters.
Behind the elite hobgoblins and bugbears would come any sort of hobgoblin heavy cavalry as the biggest hitters of all. They are probably right behind the bugbears.