May I ask what type of leads did you campaign to and roughly what was your response rate?

Hire them hourly and put them under your wing... this is basically like the interview process... you groom the individual slowly giving them more and more responsibility over the next 2-5 years until they can run the job site on their own with minimal input from  you and can clearly communicate any issues that may arise.

I am afraid that I will buy it and stay vacant because is so big (It will rent at about $30,000 per year and renter is responsible of NNN,or at least is what the realtor estimated).

@Caleb Heimsoth thanks for the response. 

To answer your question (and this is my take on it):  Considering you just started your Real Estate Investment firm, you may want to start small and work your way up unless you feel you can handle the greater responsibility of managing a four plex vs a single family residence.  

Who has responsibility when a trailer burns down when you are on land contract? 

Your question is more likely to get a response on this forum

Feel free to leave it here too just in case but do post in the other forum for the best responses. 

I would think that is your responsibility and something you need to turn over to your insurance company.

@Clayton Mobley Thanks for your in depth response.