Welcome, Wulong84.
Welcome to DMT-land
I know what you mean about "My serotonin level goes up after this experience [...]".
Myself, I feel enlightened and happy for days after a good DMT blast. Best anti-depressant ever!
So what sort of plants are you trying to extract?"
If you're able to get your hands on Mimosa, a simple STB will work.
People tend to suggest Acacia Confusa nowadays it seems. I performed my first extraction yesterday, using an overkill amount of Naptha so it'll be about a week before I see the results. I like to slowly evaporate.
Anyway, if you need any help with your extractions or have any questions, feel free to ask away!