Don't cut them unless they're wilting, or dried up. The plant needs to collect as much "sunshine" as possible.
KEEP THE LEAVES!!!!! I personally mesh them into a pan with canola oil and grinded weed to create thc oil. The rest goes into my steam generator... & trust me, It smells lovely.
Here fellow grower, I found a couple links for you !
https://www.cannabis-seeds-bank.co.uk/dutch-passion-taiga-auto-flowering/prod_590.html
https://www.cannabis-seeds-bank.co.uk/nirvana-seeds-northern-lights-autoflowering-feminized/prod_1280.html...
I was very impressed with Querkle, Jillybean and Silver Haze. If you're looking for inexpensive seeds i'd personally say go for G13 Labs Blueberry Gum, Delicious Seeds Northern Lights Blue, DinaFem Seeds RoadRunner#2, or EVA SEEDS Monster.