Well, the answer to a lot of your questions is truly up to personal preference. Do you want to try 2 circulars or the Magic loop technique? Do you want to stick with DPNs? There really isn't a superior technique for knitting socks, but knitters decide that they prefer methods over time.
Or you could just buy one size of DPNs and stick with it. What size needle you use depends upon how tight or loose your knitting is and how thick your sock yarn is. Say you are using fingering weight yarn. Most people knit that on a size 1 needle. If you are a loose knitter, use a 0 and if you are a tight knitter, use a size 2. You'll notice that there is only 0.25 mm difference between the needle sizes, which is tiny. For my first sock, I would pick a size 1 needle, knit a swatch to figure out how many stitches per inch I'm getting, and then cast on. You can knit socks at whatever gauge you are knitting with a little arithmetic.
Also, any of the how to knit themed books are a pretty good resource for a project like that (I recommend Vogue Knitting: The Ultimate Knitting book because it is super comprehensive or the Stitch and Bitch Handbook because I learned how to knit with that book.
I recently started a lace project for the first time and have a question regarding life lines. Does anyone know of an easy way to thread a life line when using the Harmony straight needles. My project uses size 15 needles and is knit flat. I tried it on the circulars but had a lot of trouble getting the yarnovers to slide back on the tips. Any suggestions would be appreciated. Thanks
I only used a life line once, and it was very helpful. I used a length of totally different yard so I cound find it easily, then threaded it on a darning needle and pulled it through the stitches on my needles. Cut the life line yarn 6-12 inches longer than the item you are knitting so that it doesn't pull back up into the knitting inadvertantly. I did this after I restarted an item like six times due to minor mistakes. Great time saver.
If you were using circular needles, you could use floss as your life line and thread it through the hole that you use to tighten the needles. It would move through the stitches as you knit and would could just leave it there at the end of the row.
With straight needles, finish your row, then thread your life line onto a tapestry needle and thread it through all of the stitches on your needle.
I don't have a question, but just wanted to comment on the new content of the KP site. There is so much great information, and the formatting has improved greatly. This is the best place on the internet to learn about knitting, talk with other knitters, and learn. I finally got to view several of the videos, and they are fantastic. Great work!
Some people don't like to purl, so they prefer to steek a raglan cardigan instead of knitting it back and forth. Steeking is also great for fair isle knitting because it's easy to steek a v neck or open a cardigan but not worry about knitting all of those pieces separately while carrying the yarn.