Mamakas1!

New to growing my own Medical Cannabis. I 5 very nice plants growing that have flowered. They are around a week apart from the growing stages between each one of them. I have 3 Sativa sand 2 Indica's. The first plant to be harvested will be 2 Sativa plants, in approximately 2 weeks. The harvesting time is what I’m confused a little about. When harvesting is it best to just harvest the buds or do you pull the whole plant for the drying process? If you just harvest the buds for drying, what happens with the rest of your plant? Does it keep producing? Or is this what you get cbd and hemp from the rest of the plant? Sorry for stupid questions. I also noticed that down the street from me there is a licensed hemp farm. Is that just a new legal name or is it just licensed to grow for hemp?
I can send pics of my babies.

Signed slightly confused
Mamakas1!