I used 0% interest credit card promo to finance $20k utilities to the property and it still needs 10K to get it in mint completed condition.

This is important to show your lender so you get credit for your payments towards your total DP at the time of closing.This will buy you time to get the rest of the funds, and also lock up the property.If you negotiate a longer Option period than from now to 4/18, you will have a longer time to get your funding in place, and get a larger total DP credit.

I use a credit card that offers airline miles for every dollar spent.

The failure can cause water leakage and flooding in homes resulting in severe property damage.

If you offer some type of incentive to leave, she may choose that over going through an eviction process, which will save you a headache and worse damages. 

Any other good ways to start out I don't have built up capital and I'm working on fixing my credit to have more options in regards to that in the long run

I have been in the property 2yrs with partial rent credit. lease is almost up.

If you are wanting to buy in Dec/Jan timeframe you should be working with a mortgage broker now to take a look at your credit.  

So I'm getting ready to head to the bank to hopefully set up a line of credit.

I have already been denied from 3 hard money lenders with a credit score of 710.