Serve the Notice - go to JP Court and file for Eviction.

The bidder subsequently filed to rescind his bid, however lost his deposit and was forced to pay additional fees to cover court costs. 

This is my first property so I’m wondering how imperative it would be to have one And how quickly after closing that I should file for one?

The repayment terms for a 401k participant loan are equal monthly/quarterly payments of principal and interest (typically prime plus 1%) over a 5 year term (longer if used to acquire your principal residence).Please note that if you take a full $50,000 and then pay back the loan, you can't take another $50,000 until 12 months after the first loan was fully paid back.Per the loan offset rules that went into effect with the 2018 Tax and Job Act: if you leave your job and the loan is current at the time you leave your job but then the loan goes into default because you left your job, you will have until your tax return deadline (including any timely filed extension) to make the loan current by depositing the outstanding balance into an IRA (and thereby avoid the taxes and penalties that would otherwise apply).Please keep in mind the multiple loan rules:Under those rules, the sum of the balances of a participant's outstanding 401k loans under a single 401k plan (using the highest outstanding balance of each loan over the last 12 months) can't exceed 50% or $50,000 whichever is less.

You can file the LLC online with the state corporation commission.  

If they are truly squatters they you file a "Wrongful Detainer" action.

@Joseph NiedermeyerI'm by no means a seasoned investor, but as someone who owns multiple properties/multiple mortgages I've found that lenders are more interested in downpayment % and positive revenue from owned-properties in annual tax filings, more so than credit score.

A lot of folks are comfortable with anything more than a year because that represents two tax years and two tax filings. 

I of course plan to continue writing off expenses, reporting income as I always have and filing as I always have.

Require that she file a police report if she wants to say its vandalism.