Seeking advise for first time homeowner.

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Just got my first deal offer accepted today bronx Ny. Im doing house hacking two family.2 bedroom over 2 bedroom plus basement with separate entry. Using FHA loan. When I went to wiew the propert, I didn't like the way the existing tenant is living in the apartment. The apartment was very disorganized. The seller can not deliver the property vacant because his least expires March 1, 2020. I could be wrong but my first impression is that I do not trust that he will pay the rent in a long run and keep the unit clean. How do I handle something like that? How do I collect rent from him? I am going to manager the property myself. Also my realtor recommended a lawyer and inspector to do inspections. Should I use his recommendation or look for my own?