You will have loads of company choices to pick from when going to the Hydro Store.

I use SuperNatural Veg to get them started, then SuperNatural Bloom to induce flowering. I also use a product called MOAB that seems to be very popular. You use it during the first week of flower to induce flowering, and then also during the last two weeks to kick them into high gear for the last couple of weeks. Do note none out of the three of those products are organic, if you are looking to go that route... you will need to explore further.

In short, people use tons of different types of nutes. You need a bloom, veg, and a product for flowering. Oops, also forgot - I use a product called Hygrozime the entire growth which helps clean the plant out and prevent nutrient build up.

Care to tell us more about your plans? Check out my grow log in my signature. Best of luck