If I set up a wireless router and give all of them access to it, can I be held accountable if any of the tenants download illegal music or hack a government website or something?

The house is already wired; I just need the box and router set up. 

The main positive part of my experience is the agent that was assigned to me. She

I've got ~2100 feet on top, so I cut a 10' long section 10" high on each side and covered them with wire mesh to keep animals out. 

The 1st consultant even "pretend" to have good relationship with me and PROMISED to help me step by step, so surely she knew she was leaving way ahead, why wouldn't she tell me she was leaving?

It is a solid black mesh with no holes, although it will let water seep through slowly.

She told me she hadn't talked to a reator yet but they were putting up the house for sale in the Spring.

The ability to speak the hard truth with empathyIt doesn't matter how good a mentor is: if they don't mesh with you personally, it's going to be a disaster.

There was great invention of WiFi back then allowing me to have my laptop not chained to a router with a long 50’ cable.

If I were to get internet, I'd probably put the router in the back laundry room which is 200 feet from the front of the building.