In order to build the wall, first you need to prepare the base that should be done by tamping and leveling the ground. For this, you will also have to dig a shallow trench which should be enough wide just as the size of the blocks. No matter whatever you apply, but make sure that the base should be completely leveled. You next step would be to gather the right amount of the material.
Once you have the pre notion of the base, now you should start getting all the desired materials. Calculate mathematically the number of the blocks you would require to make the building. In order to give a steady look to your building, you should make sure that each of the blocks are properly layered and leveled as well. Once you arrange the blocks now you should furnish that with white colored sand and cement so that the block gets steadier.