Find a good substrait that is high in iron and for down the road a bottle of fertilizer for aquatic plants. The substrait will do most of the nutritional needs your plants will need, fish will cover the rest, fert for when you really need it. Also the best thing you do is get a book on aquarium plants, find one that has pics as well as a good discription so that you may look at your plants and like fish, be able to determin thier conditiom as far a infection, fish nipping at them, low Co2, or needing fertilizer. Also keep in mind that certain plants may look dead but they are in a state of dormancy as part of thier cycle, so you need to learn your plants so you do not remove what looks to be a dead plant whenin accuality it is just going through a rest phase.
Side note: Iron is needed as it is a catylist for photsyntisis, too much can be bad, to little and the plant starves to death.