This is a list of files that you may want to look at. As your skills Advance you will find them easier to mod.
Most of them just reguire some copy and pasting or changing numbers.

rules.skrit  ///change experience gained. and skills points per level.
heroes_ds2.gas /// change what you start with in the way of levels and skillpoints.
ds2_world_pm_hero_based.gas /// change what the hireling start with in the way of levels and skillpoints.
shops.gas ///with the proper know how , you can have your items always sell with the proper code in here.
give_gear_*.flick ///give specific gear to a specic character.(replace the * with the character name)
pcontent.macros ///change drops and even make it so that your item always drops.

there are more but these are ones I have found easy to Mod.