You must start from the bottom tier first. All wall material has designed specifications for maximum height. Start with this in mind and plan out your project before you begin. It is imparative to create the proper base. Skipping this will only create problems in the future.

Any brand of segmented wall material would be OK. Use the one you like. Always look at the actual stone ( the brochure pictures can be decieving) A maintenance free wall is a properly installed wall. Wall stone can be very heavy and hard work. If your not absolutly sure what you want to accomplish or have questions about the installation process. Professional on site advice will get you started in the right direction. The fee could save you alot of money and many hours of your hard labor if it has to be removed and done over agian.