I don't feed my plants until they have at least two (or more like four) sets of fan leaves (so that doesn't count the first two round leaves). If you feed them too early they'll actually die. Start with a little (very little) food after a few sets of leaves, and lay off if you see yellowing of the leaves. Then increase.

As far as direct sunlight, that is actually fine, even early on. Just keep an eye on them. If they start to wither up and look stressed, put them in a more shaded spot. But don't leave them there long... after a few days when they recover, get them in the sun again. They can take direct sun a lot sooner then they can take fertilizer.

Then again, WTF do I know...