I love toe up socks -- I started making them that way after my first attempt at cuff down socks went terribly wrong.
I started with the figure 8 cast on from this page:
[color=blue]Toe Up Socks[/color] but be warned that the figure 8 cast on can be challenging. Once you get the hang of it, it's great but it can be a bit frustrating at first. Stick with it and you will be fine.
I am now following [color=blue]Silver's Sock Tutorial[/color] for 2 toe up socks done using Magic Loop and that is great too.
I hope you find something here that helps -- if you do a web search on toe up cast on you will get many other options.