I have to agree...toe up is the way to go! So much more control over the amount of yarn you have vs the final size, leaving enough for the 2nd sock etc. In general 100g skein will make a basic pair of women's socks...depending on how long you want the cuffs. I wear a 9 and have done 8" cuffs on each with one 100g skein.
For a beginning sock person, I would start with DPN's first until you get the hang of it. Unless you are already very familiar with the magic loop or two circular sm. diameter knitting.