Even an entry level job at a big box store may be enough to at least get you a discount on materials and a great way to network with local landlords and other trades people.

The Bigger Pockets book store if full of great books: https://www.biggerpockets.com/store

For people who anticipate moving regularly, buying may not make sense.

The interest income from a loan payment is regular income, not capital gain no matter how long you have the note in your portfolio, and this is why I buy notes in my SDIRA for my personal portfolio.

My question is, what should I look for in seller financing, ask about, avoid, would I use the same PSA as a regular purchase, etc.

Make sure that they will return your phone calls promptly.Track all of your income and expenses in report form and review them regularly with a few others you trust and want to see you succeed.  

The Bigger Pockets book store if full of great books: https://www.biggerpockets.com/store

Just regular mail since you don't have an office is fine.

Most of our house is kept fairly cool but we regularly turn on a gas fireplace to warm up a room we spend most of our time on.

Problem I have found is that tenants want to store crap around a gas furnace and hot water heater .......................FIRE HAZARD .