There are no specific "ideal parameters" that are needed. You can use plants and fish that like just about any combination of parameters you might have with water that is drinkable. Low KH is good for most plants, but higher KH is fine for most plants, too. GH should be high enough to ensure that you have adequate calcium and magnesium in the water for the plants, but you can routinely dose GH builder if you have any doubts about having enough. The pH will be whatever matches the combination of other parameters, and any pH between about 5.5 and 8 will work for most plants and fish. You don't want any measurable ammonia, so zero is the best value to have. Nitrites should also be zero to avoid harming the fish.
I think it is a good idea to test your tap water after it has been in the tank for a day or two, just to know roughly what kind of water you have. Test the GH, KH, pH, (and ammonia and nitrites if you are trying to cycle the tank before using it). Anything more is mostly to entertain yourself.