Depends on your location as to when is "safe" to put outside, but if you are past threat of frost, they should be ok. Check the farmers almanac or sunset online for your outside plant dates. Being so small and young though I would protect them with netting or something outside, Maybe a plastic hothouse lid or something til they get size (to lessen the risk of them being eaten by deer and such) Plus bugs may be a problem.

You should keep the soil damp, but not soaking wet. Like they say 'MJ does not like wet feet". G/L and be safe outside mang - many prying eyes!