When building your wall you need to make sure you mark your shape with string and stakes. Pick your stones and make sure your utilities are marked. Make a trench a little bigger than your stones. Then fill with sand or stone and press down. When laying your stones make sure that they are level. Cut the first block in half. You will do this every time you start a row. After you have got the desired height and do some back filling. Then put a landscaping fabric behind to prevent the dirt from leaving.