Best thing may be to try this out on a small swatch. Just cast on 25sts or so and repeat the sequence of rows as given in the pattern or as Merigold has written it out. Then you'll see how you get the bumps and the definition between rows.
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The bump is because there's 2 or 3 rows of the purls showing on the outside of the pattern. Yes, just try out the rows as written in the pattern, practice it on some other yarn. Knitting is just using the knit and purl stitches - the way that they're combined is different on different patterns. Sometimes you knit all rows, sometimes you knit one row and alternate with a purl rows. In this pattern you knit a couple of rows, then purl a row and knit 2 more rows and keep going like that. If you just follow the pattern as it's written your work will come out looking like the picture.
sue- knitting heretic
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