If they refuse to move out, start the eviction process through an attorney to show that you're serious and they'll probably scatter quickly.As for the deposit, you keep it until all charges are accounted for.

You are entitled to charge them until the unit is filled but if you do I would try to make as amicable as possible. 

Not sure how you came up with the 4% management fee as I've seen most PMC's will charge 7%-10% depending on the market and how many properties they manage for you.With that being said, you can buy SFRs in just about any market.

If an LLC member gets any type of court judgement against him then the creditor who won the judgements gets a Charging Order to collect on that judgement.

Just as I would look at a company's 10K your gross income is $24,000 and your net income is $12,058 which just means the amount you have left over from all expenses. the only way I would think your NOI will differ from net rent/ income is if you charged for parking or had a coin mech laundry or something like that. 

Just make certain you pay off the bill in full monthly to avoid interest rate charges. 

Even hard money lenders that charge higher interest and 2-4 points want 20%

Here in CA, we have specific laws that specify how much a contractor can charge upfront which is $1,000 or 10% of the total job, whichever is less.

I also have a charge card, an Amex gold which is my primary card which I pay off in full every month.

If you can honestly say you would have told him no if he had asked, then you could charge I suppose.