Would rain destroy my outside grow?

I poked some biggish holes bellow my pot for excess water but Iam not sure about the rain

Light rain you should be fine, anything more than that I would recommend putting something above the opening of the pots to deflect excess rain away from the pot, rather than having rain constantly flowing through saturating the roots.

Yes. I would avoid getting any moisture on developed buds.

Yes, to elaborate- If you are talking about developed buds it is NOT ideal to get any rain whatsoever on them. If you're talking about plants in veg, then my advice applies.