Swales and berms are a good idea while you are transitioning, though I don't think you would have the quick profit you are looking for. We are in the high desert of California and have swales/berm combos and right now the squash and beans are easily doing the best. I'm sure for your climate you could tomatoes fairly easy. Maybe try to find something that is lacking agriculturally in your area that would do well with minimal water and try to market that. Or you could grow something and turn it into something else for a larger profit (tomatoes, peppers, corn, onion, cilantro and make a unique salsa or something...) Establishing a food forest is going to take you a while. Is your main motive profit right now?