Advice for getting my first deal

[Luis Valdez]

Hey BP nation,

I'm looking for multifamily homes in the s. jersey area. I'm still not pre-approved but my credit is in good condition as well are my finances. 

I'm looking to get into a deal with my fiance but she has an average score and some collections on her credit.

Should we start the empire with joint credit or just lock in our first deal under my credit?