I'd check out websites for garden block manufacturers. Plus, I'd use
that type of product, not cinder block, as they are very attractive and
available in a variety of styles, go together without cement, etc.,
while cinder block is about as ugly as you can get. I think you'll
find that the manufacturers generally don't require footers, the
product is designed to go on a well drained, compacted base. Anchor
concrete is a supplier here with a website.