Hey there, you don't need the heat pad or the nutes yet. Just keep them in the domed tray under the flouro until they reach near the top of the inside of the dome. Then put them on the drip and add the nutes. You can really only do 5 decent plants in there. I made some modifications after each grow too. Removed the shelf, sealed the inside door seems, got a new tub with only 5 holes in the lid. I don't veg long so they don't run out of room either, learned that one, lol.

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Chiceh
Peace, Love & Weed