For social skills, I would focus on lockpicking for the most part (if u can call them social). Your rogue should focus on that.
Leadership is a good one as well, which can be on either the tank or one of your main characters. Charisma should be on the main character you will use for most of the talking, it is necessary to win Rock Paper scissor stuff. As for using a wand, it's up to you. I've read that dual wands are better while some prefer staff, I prefer staff bc if i dual wand, it takes 6 AP to attack unless i start investing in dual weaps or something, and i rather save the points for other things, while sticking with staff and its 3 AP attack "staff of magus". You get 4 characters in your party, don't need to invest all of them into the same thing.
If you want, the party member you wont be using, you can invest in crafting and blacksmithing on them, and just switch them out when you wanna do any crafting. Loremaster is also important, so get it one of the main 4 characters so you can identify loot and identify enemies
