This has been covered so many times before..
For low levels, use the WIS line. Do STR/WIS or hell go for AGI/WIS if you wanna have some fun.
Only if you get two GOOD weapons then DW becomes the setup of choice. But I wouldnt bother with DW while levelling; that leveling will cause a good weapon today to suck tomorrow. Better stick to fencing which will give best overall performance.
Around lvl74 you could start thinking about DWing.
Oh yeah forgot to mention this: Fencing is cool
edit: typo