If you're seriously interested in the Lionbrand pattern, we should be able to help you with the gauge. Usually you cast on several more sts than the gauge numbers tell you, knit for 4 inches and measure across the center 4 inches of the gauge swatch. For an afghan, gauge isn't as critical as it is for a sweater but it'll give you a good idea of the finished size of the afghan. No surprises.
Can you give us a pattern link?