If I was starting lace knitting from scratch I would take a lace pattern that was only worked on the right hand side , where you were just knitting stitches , doing a few different decreases and a few yarn overs. A pattern that just consisted of 2 rows , row 1 , the lace pattern row and row 2 , all purl stitches would allow you to get into the rhymn of lace knitting, let you see where the decreases sat, which way they slanted and you could easily rectify any mistakes without getting in to a total mess.
The free valentine cowl pattern consists of just 2 rows, rows 1 is knitted all across and row 2 is where the lace pattern is. These 2 rows are repeated until you run out of yarn. Here are the instructions
As you do more and more lace knitting it will become more important that you do understand your knitting and that you are prepared to take your knitting back a few stitches to sort any errors out.