Knit and purl. Making the sts is the only way I know to work on getting your tension even, probably the most important thing in getting your knitting to look like you want it to, and for learning to recognize mistakes. I think starting with some cotton yarn and making a dish cloth or wash cloth where a few mistakes don't really matter is a good way to start. Don't despair over making mistakes, that's how we learn, and even the most experienced knitters here might admit to making them now and then. I'm not that experienced and spend a lot of time fixing mistakes.
You can't knit the left sock first. Ever.