Casting on stitches—need help

When I want to knit or crochet and only have a pattern without instructions, how many stitches or chain stitches do I need to start with for a specific size—for example, size 44? Does anyone know? Best wishes 

There’s no simple answer to that. It depends on the thickness and type of yarn, as well as your knitting or crocheting style.
You’ll first need to do a gauge swatch—that is, knit a small sample piece. You can then measure it and calculate how many stitches you’ll need.