In Delaware a lease automatically rolls to a month to month lease if no renewal is signed and 60 day notice is required to vacate (or to give notice to move)  If you prefer to have it vacant in the summer then give her notice to move and not leave it to chance. 

If you have cash, know that 99% of wholesalers will have low repair values and high ARVs that don't match the actual data or upkeep of the house.Also, ask if this is being daisy-chained, meaning are there other wholesalers or investors in the line between the person offering you the deal and the seller.

I personally would approach this with a self assessment.

I asked preferred vendor but lady on phone said you can use anyone available.

Anyone got a good recommendation for websites that can provide me a deeper analysis of a neighborhood, preferably on a zip code basis?

like - your own market. or a market a couple hours away that you can spend some time in person in. or where you went to college. or where you like to vacation.

Local and state laws are changing on the daily so I think that the right Property Manager really helps with that but hiring a PM or self managing is always a personal call.

For if you lay the foundation and are not able to finish it, everyone who sees it will ridicule you, saying, 'This person began to build and wasn't able to finish.  

You want to be able to select who rents your house and how do you know the person they sublet to will pay the rent and take care of the place?

well, I guess nobody knows where to find him and the one person who is reselling his materials is terrible at marketing and doesn't respond to email questions.