No, you don't need to learn on straights. I honestly don't see a reason to even bother with them. A set of circulars gives you the flexibility to do any type of knitting, so you end up saving money in the end.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry