If you increase one stitch in your 5th stitch, 19th stitch, 35th stitch, 49th stitch, and 63rd stitch - that should give you 5 stitches, pretty evenly divided.
Re: Gauge - Cast on 14 stitches. Knit for 18 rows (Knit one row, purl one row). When you are done, it should measure three inches square.
Hope this helps