Done to learn continental knitting and purling:
CO 25 st.
K 5 rows.
Row 6: (K5 P5) to end.
7-10: K5 then knit into knit st and purl into purl st to last 5 st, k last 5 st.
11: K5, then knit into purl st from row 10 and purl into knit st from row 10 to last 5 st; K last 5 st.
12-15: K5, then purl into purl st and knit into knit st.
This should make a checkerboard pattern with a garter edge of 5 st on each side.
Repeat rows 6-15 until you have enough yarn for 5 final rows; knit these last 5 rows for a garter bottom edge.