Hey man,
I would not recommend to occupy an abandoned house.
Also finding a lab that you could join is highly unlikely as professional chefs would never share their adress with anyone, which I would recommend to you too - never share the adress of your lab with nobody!!
Also, a lab shouldn't be set up in your home or garage anyway, the good old days are over where this can go through easily. It is too dangerous nowadays.
That being said, I would suggest the following:
Rent a garage out of town/in another city anonymously (pay in cash/use fake ID documents) for 50 - 150 EUR/USD (depending on your country/location) a month where you can then set-up your lab.
This is not the most ideal option but definitely a good start. If you can not afford this, I would recommend you to safe up a little longer as security should not be compromised for monetary reasons.
I can strongly advise to read the book
The Construction And Operation Of Clandestine Drug Laboratories before you start your operation and stick to those rules as if you're holding on to your life man!