You can accomplish this with Google voice too but your options are minimal.

Let's say the girlfriend doesn't work, or makes minimal income--do you allow them to move in as long as their total "household" income meets the minimum standards, or do you require them to both earn enough income on their own to quality?

The great thing about wholesaling is it only costs you time, and minimal marketing expense depending on what types you decide to use.

Your mentor may tell you it's enforcable, but the likelihood of them pursuing it, let alone prevailing, would be minimal.  

If you build a new house with your dad you'll have 3 advantages; you can build it to your exact specifications, you'll have minimal maintenance issues and, most importantly, you'll equity right out of the gate.

It dawn on me the other day that trying to do this one infill at a time was very difficult and expensive sounds like you burn thourgh 250k a year in overhead just finding your deals.I was always being pitched smaller 2 to 5 lots deals.. and now I made up my mind to keep my minimum at 10 and preferable at 20 to 30.. now we don't get the big hits building these kind of subdivision like you can on a remodel if you smoke it on the buyBut we also spend no money on marketing..

As for advice, ensure your personal finances are in order, minimize your debt, secure a job, and learn learn learn form all the resources here on BP and any real estate book you can read.

This will help to minimize interest payments over time, if that is a goal.

Should I redesign these flyers and pitch them to the agents, or would that, too, be a waste of my time?

I'm using bandit signs, sending letters to distressed properties, craigslist and newspaper ads with minimal leads/deals.