I have an office set up in a spare bedroom and it is all business.

I started a similar way by buying an SFH as my primary residence and renting out the spare rooms.

Check out:How I turned $1000 into Five Million in Real Estate in My Spare TimeBy William NickersonI did a video on his investment technique:http://youtu.be/EzxrxiSFx50

There is a small fee for this course.My take after going through the course: investing in Non-performing notes is not a part time-spare time venture.

In my opinion and based on my experiences, you always want to have reserves for "just in case sh*t happens".You can also be an apprentice for an investor or contractor in your area in your spare time.

Contamination can be any size, such as a heating oil tank to a gas station/small oil company.Im aware of compaction issues, so in some cases building construction could not happen although there are other uses for such land.

A 2-4 unit property, sometimes referred to as a “triplex” or “fourplex,” has two or three available units to rent out.This is different than having a spare room, or a basement with a kitchenette.

I have been seeing houses with agents sparingly for the last few months to gain experience assessing repairs.

Which is why I am considering the note market, I can do it in my spare time and it will require much less in the area of maintenence as far as repaid and finding new renters 

Lots of good suggestions already.I know that some investors will pay people to sleep in the properties overnight.Also, if you have a spare car, leave it in the driveway at night.You MUST have motion sensor lights outside, and alarm signs and stickers.Portable alarm system.