Well the ktog or ssk sts are called decreases, even though they don't decrease the stitch number because of the YOs.
A YO is made just like a knit stitch except the R needle isn't inserted into a stitch on the L needle. So you should be wrapping the yarn from the back through the tips to the front and over the needle to the back again. That's about the only way you should be making it, and keep it fairly loose. If you wrap it over and down then to the back it'll be backwards, smaller and if you don't work it through the back loop on the next row will pretty much close up. Also, it takes some patterns an inch or two before they begin to look like the picture.