I want to know, how do you use classnames? I downloaded RH Pistol Pack, and like some other mods, it has classnames for each gun. The thing I'm confused with is what do you do with the classnames to get the guns in the mod?

Either use the RH Pistol ammobox in the editor to play with them all, or give yourself a specific weapon like this:

removeAllWeapons this; this addMagazine "8Rnd_45cal_m1911"; this addWeapon "RH_m1911sd";

That will remove your normal weapons and replace them with a M1911 SD with 1 clip. Always add at least one magazine before adding the weapon.