Scouts start off the game with just a single dagger. They can also equip swords and later on and learn how to dual wield. While getting large critical hits with the dagger is nice, at these low levels the Scout is the most fragile of all of the classes and a missed critical can mean death. A solution to this is to use a sword instead of a dagger. It provides steady damage instead of spike damage so there is no need to worry about killing your target. As you get higher in levels you can switch back to a dagger to gain the potential to kill monsters much faster. Scouts can become either Assassins or Rangers.
Assassins continue to work the same way the Scout does, using stealth and high damage to gain kills. There are no new weapon options really for the Assassin, you can choose to pick up a dagger or a sword that is of higher quality than the one you are using and continue on your way.

The Ranger is probably the largest shift from starter class to second class in the game. The play style shifts completely, from attacking monsters head on to kiting them and firing from range with a bow. Rangers should take the bow option from the quest reward, without one they cannot use their new abilities. Rangers also need arrows, and vendors do sell them though it can be hard to locate the appropriate one. The best place to find arrows is after you leave your race's capitol city and go to the next quest hub. One of the vendors there will have them and there is a lot less guessing to be done.