Honestly, none. You're not a blizzard to do exactly like them, so do as you see fit. The only advice I can give is for the player to immediately have + 5 points of characteristics so that he can decide which class he could play for and then it is very difficult to get to the first level to acquire skills. Well, or when you choose items, then let's say you are given +5 to strength if it is a sword and +5 to dexterity if it is a bow. I also understand that you want to make a warrior magician so that everyone can use magic, so this is quite an interesting system, like in titan quest to switch weapons to get the necessary skills, in orginal Diablo it was also like that, but not like yours. Anyway, I turned on the nerd, the game is good, I'm waiting for the next updates. (I wrote through a translator as there may be errors)