Like said above, 3 weapons sp costs compared to 2 isnt that much of a difference. Anyway my personal preference when ur low on sp:
1hand+shield, needed to tank ( pve/group pvp), get only the passives and some lv 1 one hand skills. Lv 1 skills generate pretty much the same aggro as lv 10 or higher. Also, get shield crush up to lv 10 dull which increases ur dmg by 50% ( tripple swing etc..). I cant stress enough how important the 1hand passives are. Someone above mentioned to only get 2hand, when ur serious bout pting ONLY GET 1hand.
2hand ur main dmg source in pvp and usefull for pve, I really would get all skills here but I guess u could skip bash altough its great vs opponents with shield. I find warcry not to usefull either, I switch so much its not really worth casting. But when u go pure 2hander in group pvp it might be usefull.
Dual axe, when u dont have alot sp, up the passive to lv 60/70 and max sudden twist for bleed/stun. I would get all dual axe skills but the worthless passives and that stun skill with the big cooldown. The looks are really cool, dmg kinda sucks but I really enjoy using them cause they look to dammn hawt. Also for me lv 90 -100 dual axe skills costs around 150k sp more. Which is nothing considering I am farming 1mil sp.
Just one tip, no one will notice when u use low lv taunts

. And they cost quite some sp. Also lv 80 protect works more then fine no need to up it any higher then that. Descry is worthless. I would max all other skills like skins/screens/vital.