Just get going. Coral are easier than fish - you don't have to feed and they don't get ich. Get some xenia, mushrooms, kenia tree, colt, toadstool - these will make you hobby more interesting and lively.
I would stop worrying about params for now - soft corals will let you know if something is up. Yo can always get water samples to a closest LFS - they will measure everything for free and correctly.