Hi and welcome to the forum!
The easiest way to do moss st
is to recoginize when you have a knit stitch from the previous row and when you have a purl stitch. You can work moss stitch over either odd or even numbers of sts if you just look at the stitches from the previous row. If it's a knit stitch (a stitch that looks like a V), purl it and if a purl stitch (one that looks like a loop or bump), knit it. That way you're not dependent on remembering what sitich to start with or what pattern to follow.