They are many "complete" lines of hydro nutrients. Generally, it's a two or 3 part (2 or 3 bottles of stuff: Macros, Micros, Boosters) system that requires you to use specific quantities of each bottle to form your solution.
If you want a lot of help, try the "General Hydro" series ... plenty of our hydro growers here use it and you should be able to get some good advice from them. GH is a very simple 3 part system.
My advice? Make sure to get a pH test kit of some kind, regardless of the nutrient brand you select ... it is a hydro growers best friend
C.C.