Answer:
You can get arrested.
The other dangers depend on the process you use. One process requires two dangerous chemicals, the other requires four. If they don't kill you they can explode.
Any meth lab is considered a hazardous waste site by default.
If you try to sell the meth and your meth sux, the buyer will probably kill you for ripping him off.
If you try to sell it and someone already has the meth franchise for your area he'll kill you.
If you sell your meth to someone and they die, his friends will kill you for killing their buddy.
And if you take some of your meth, IT can kill you.