Yes, Archer is the only Fighter/Mage in the game. The second weapon can be either a dagger or a sword. If you decide for spears then keep in mind that spears held in both hands (the only melee weapon equipped, no shield) have one "dice" more than they declare. For example, Mighty Halberd is 10 + 3d6. Therefore, a Mighty Halberd kept in both hands is 10 + 4d6. You need to add a good second weapon to it if you don't want to degrade your power.Also, keep an eye on the weapon speed. In MM7, your weapon speed equals to the weapon speed of the slower equipped weapon. If you add a sword and you aren't really good in swords (long recuperation time) then you slow your fighter down.
The best second weapon is a good dagger, that means Exquisite Long Dagger (7 + 2d3), preferably with magical attack 
Daggers are very fast so that you need not care for weapon speed (the spear will be always slower).
