Questions about datura?!

It's most likely legal to grow the plant (atleast I'm assuming, seeing as my dad has one growing in the backyard) but to actually ingest it is legally questionable. I'm in CA so idk if they grow in Jersey, I'm sure you could find some rather easily though.
Best way to ingest is orally.
Proper dosage? There isn't one really. The potency is so variable, not even just from strain to strain but from plant to plant. What could be an ok dose from one plant could make you completely delirious with another.

As a drug enthusiast who has tried just about everything, even I'd kinda recommend not doing it. I haven't actually tried it yet but I've heard nothing but bad stories, ranging from just having a bad time to ending up with terrible situations.

However, if you are gonna try it (which you most likely will if you have your mind set), have a sitter who can watch you and make sure you don't kill yourself or anyone else. Have at the very least an entire day free, possibly a few days.
Good luck

It's legal and can be bought online, or anywhere they sell plants if your lucky and find it. Most people make a tea out of it. Search erowid for doses.