Monk or Princess in your party. Choose one or both. If both, make sure Monk has at least one Healing and Princess has some Royal Veil. Get Guard Order if you do not get a Hoplite.
If only Monk, build a party that's strong while using TP, which means it'll tire out faster for dungeon crawling but be more effective against FOE or bosses. Get a class that has abilities that help keep your party from getting hit (such as Hoplite).
If only Prince/ss only, make sure you stock up on medica or have some way to do minor touch up healing. Get plenty of Royal Veil. Get Guard Order if you lack a protective class such as Hoplite. Build a party that performs well over a long time without using much TP. This party will be great at dungeon crawling, but be weaker against FOE or bosses (though it can get through).
Following those three main models, you're fairly well set for the first stratum. For DPS's sake, you will probably take out the Monk or Princess, if you used the first option, since you can simply have one subclass the other (which ever you like). Same with the other two choices: most common subclass for Monk or Prince/ss is the other healing class.
But yeah, otherwise, just go with your gut.