Congrats to using the term concrete! First rule: run away from any contractor who can "pour cement". Portland cement is an ingredient in concrete and concrete is placed, not poured. Investing in concrete is not to be taken lightly; it is extremely difficult to find a contractor who knows the science of concrete and can provide the owner with a good value. The vast majority of concrete is incorrectly done and a terrible waste of money for most. Correctly done, concrete will NEVER crack. Proper base preparation and proper curing of the placement are the most often overlooked. Good info is available, this isn't a place for uncle Ed's reflections on his "help with the neighbor's cement" (worse if pronounced see-ment). Stick with dirt if at all possible and buy more tools!
(In a previous life I was employed with the Bureau of Reclamation in materials testing (yup, concrete) and the job was to protect the taxpayer's investment in concrete.)