0% Down & be debt free in Sept. or use savings for Down Pay?

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Background:

22 Years Old, Single- No Kids

$30K Annually - Government Employee (Love my Job)

Debt = Car Loan totals $6,600K and 2 School Loans that also equal up to $6,000K

I'm on track to pay off my car loan on May 17th and be debt free on September 20th as I have been successful in keeping my full time job's pay untouched since mid-January. I have 3 part time jobs (Nanny, Weekend Receptionist 5hours per day, and data entry assistant 1day a week). Brings in around $750 a month for bills. (This has been a legit budgeting test for me these past few months but it's fun … lol.) 

I have found the perfect house to "House Hack" in, it was placed on the market yesterday. It's a 5 bedroom 3 bath Brand New, the previous home on the property was burned down. I had the opportunity to drive past the home yesterday and parked to find the remodeling contract outside the property, he was telling me how everything was brand-new and the foundation on the house is very durable along with the entire house as he designed the home. When asking if the owner was a nice gal/guy he shocked me when he began to say yes then ended up telling me he is the owner. He seemed incredibly trust worthy to me . The home is selling for $99,900 and I will be renting out the rooms to University Students for $575 each with all utilities included-trash, water, electric, wi-fi. I will be buying a room divider to sleep in the living. I'm planning to live there for 6 months, and save up for a down payment for the next house. I've done the calculations for this property and the ROI is 26.6%

My questions is,

1.) Is it possible to put 0% down on a loan? Is this a good or bad idea? I would be able to pay off my car in a month and get to reduce my car insurance payments as well. I completed the loan application yesterday and did include that I would have 5% down and that would leave me with needing $94,905 for the loan and will put me back 3 months on the car loan and being debt free. If having 0 down is not recommended then that is understandable.  

2.) Would it be a good idea to have 3 or 2 roommates who are know each other all on one lease or rent by the room?

3.) What is your experience on previous homes that were burned down and building a home from the bottom on the same lot?

4.) Tips, Ideas or Concerns?

Thank you all so much, Godspeed!