I love growing hydro, I grow two plants at a time sadly its all i have room for or i would grow tons more hehe
I built my own Deep water culture or DWC style see pics below
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4 gallon food container (unused) and 5 inch net baskets. If i was to build another i would make it for just two and use a smaller basket. I have two air hoses attached to airstones. I have a dual output air pump i bought from petco.I wrapped the whole thing in aluminum tape (about 7 bucks at walmart)
I filled the baskets with rocks, which you can get off ebay or any hydro store. I place a germinated seed taproot down in some parkseed bio dome starter plugs. rapid rooters work too. Make sure the plug reaches the bottom of the basket. I keep the water half way up the baskets while the plants are young. with lots of bubbles and a higher water level, it will keep the plug moist and you will be off and growing.
Once the roots have grown down into the water, the level isnt as critical. keep the water level up but not all the way full.
No nutrients are needed until the plants are a few weeks old. then i use general hydroponics flora series nutrients. everyone has their own favorite nutrients, those are just mine.
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That's quick and dirty how to start growing in hydro. its just a general overview of how i grow.
JP