Most people need some practice to figure out how to “read” knitting, that is, know where you are, what you’re doing right and wrong, what to look for. There are a few who can jump right in and make it work first time, every time, but that’s a rarity.
If I were teaching you to knit, I would suggest getting a pair of US 8 (5mm) 10" straight knitting needles. (Straights are the ones that you think of when you think of knitting needles. The other 2 kinds, which you DON’T want to start with, are Double Pointed Needles, which are 6" - 8" long and have points at both ends and come 4 or 5 to a pack, and circulars, which are 2 needle tips connected by a long cord.)
For the yarn, worsted weight, in something like Lionbrand Woolease, or Patons Canadiana or Classic Wool. There is a little drawing of a skein of yarn on the label, with a number in it, and you want the number “4”. I recommend these yarns because they are just smooth, regular yarn, no fancy slubs or tweeds or puffs added. Those are hard to work with when you’re just beginning.
I know you’d like something fancier, but if you decide to start with a basic scarf, which I would high recommend, I’d just cast on 20 stitches and then knit every stitch in every row (meaning, no purl stitches. Doing this is called garter stitch.), keep going until it’s several feet long, and then cast off. It’s a great way to really get comfortable with the knit stitch.