With rehabs you can get to significantly lower purchase prices and typically the lender will just be looking for  a100k+ ARV so that you can refinance out of the loan once rehab is completed (100k as-is value is pretty standard for DSCR loans).With rehabs experience is the biggest factor to LTV and rate so partnering up with someone for the first one or first 3 will get you significantly better terms (working in the same area can also provide benefits in terms of LTV).

You will find a TON of awesome people here on the forums representing our city who are willing to help you along your journey.My biggest suggestion would be to find some local meetups (https://www.biggerpockets.com/forums/521/topics/1211616-virt...) and introduce yourself to the host.

Other than perhaps property taxes, turnover is generally the biggest single operating expense you will endure as a buy-and-hold real estate investor.

Concerns & Risk Mitigation:- What are the biggest risks you look for?

., home tours, neighborhood highlights, agent intros, testimonials)What are the biggest barriers you face when it comes to investing more in video marketing?

The biggest reason is because it is a retirement account, your options to fix problems are more limited.

Apparently double taxation is one of the biggest hurdles for cross border investing.I would really appreciate some sound advice about this, and if anyone knows someone who specializes in US-CAN cross border tax laws, please let me know.A big big thanks in advance.

Biggest thing is to have a game plan and discuss it with a Banker to look at the mortgage options and go over numbers for best overall return. 

Make sure the policy covers not only accidents on the premises but also any potential caregiver liability.Staffing: Staffing can be both your biggest challenge and your greatest asset.

My biggest complaint for the most part now is that they don't seem to work that hard at finding new tenants, and they make it more difficult than it has to be for tenants to renew.