Some investors will cash-flow negatively, be upside down, or both but every REI strategy comes with risks.

It's best to get licensed so you will have a competent broker, a second set of eyes on the transaction who will help keep you out of trouble. 

I want to buy a new private home and use my current primary residence equity (plus some cash) to buy a new primary house cash and then sell the old one.So, I am looking for a HELOC with little to no closing costs, as I will retain the money only for as long as I am selling my old house after buying a new one.Any advice?

If you never intend on selling, no problem, but if you do my recommendation is to have your exit option very clearly laid out and a good lawyer to draft it up. 

Recently, my tenants have expressed concerns of people hanging out in the front of their units, creating some uneasiness - to the point where they want to exit their lease for safety reasons.

Today, I found out the property manager bought one of my mom's properties for a ~$100K discount (on a ~$320K property) from my mom's friend.

If you're priced out of your current market, I would definitely look into other markets where you can find great macroeconomics, positive cash flow, and amazing appreciation potential.

Another thing to note is that the land bank has a ton of cheap property but they are not worth investing in even though it may look enticing because they can be much "Cheaper" but the ROI is not there unless your a heavy cash investor with a ton of experience basically building from almost nothing.

We are using Maple Leaf Homes, based out of Sussex NB.

I have been struggling to find someone to refinance a fully tented industrial building of mine.