If you want to go through the process of registering a business here as a foreigner and do it the WFOE way, the process is long, arduous, and full of idiosyncratic hullabaloo. All in order to start operations that leave you taxed in a biased way.
Starting a business with a Chinese partner runs it’s own set of perils unless you know your partner extremely well and can trust them wholly. You’re married right?
My two cents, have your wife go through the process of opening whatever business it is you want in her name, draw up a contract or agreement stipulating this relationship according to foreign trade principles (you’re married, you make this choice as you please — additionally, with a little elbow grease you don’t need a lawyer for this) and just run the show yourself. Not only in starting it is it easier, but managing the business afterwards is way more lax.
As Rick said you’re eligible for a marriage visa, so you don’t really need to sweat having the business provide you one which is a whole other set of heartaches granted you were to take a stab at opening the business yourself.