Getting a bard that is a few lvls above the cleric to start out with hill help in the long run providing he doesnt die too much. Once the cleric catches up to the bard solo the bard using the shammy again till he can take the blues, white and red conns easier so cleric can get faster XP.
Zerker wont be of much use till high lvls but the shammy is great for Pling the bard. Once the bard gets mana regen the /melody 1 2 3 4 hotkey is great.
Could also do with a necro or a pet class instead of bard, giving the pet a 30 dam plus 2Hweapon still works at lvl 1. A pet with a temp at low lvls and a super weapon makes it a great tank and some easy XP at lower lvls. To buy the nice weapons for the pet I can make a few plat off breaking open barrels in Newbieland and selling bows till I have 40P then off to bazaar to buy any 2Hblunt, slashing, peircing weapon. Delay makes no diff to pet. Its the damage we want to exploit.
Once pet is crushing mobs fast, Haste potions or haste mask, belt froma high lvl mage works good for extra HP's and stats as well.
Then its just a matter of getting both chars skills up to stay current with lvl changes.