That said, the overseas investor (investor outside the USA) does have extra friction, hurdles or problems.

You have to decide what you want to do, stay in your local area or venture outside of your area. 

I live just outside of Washington DC where I would say the average home price is about $475,000. 

There are cash flow areas inside and outside the perimeter but working with local help is the best way to find them.  

Most landlords have no ability to raise rents once tenants are in, beyond what the board allows, nor can they ever get rid of them if they choose....outside of pulling their property from the rental market entirely.

If you are in the 30% tax bracket, that is approximately a negative 25% ROI for the plan principal that you borrowed.And, you will be taxed again when you eventually withdrawal this capital from the 401k in retirement.So, the benefits of borrowing from the plan in order to fund an outside deal need to be well worth it.In my opinion, too many folks look at this as "easy money" and promote the 401k loan as a great way to get started in real estate.  

Outside of that the forums are literally a gold mine of knowledge.

If so I live outside of USA, so can I do this online)?

I have a lender that I use for my personal loans that thinks outside the box, but with all the regulations in Dodd frank here is what they advised me:Regarding my current house (Primary): 30% Equity to offset payment with rental income for FHA purchase or 25% Equity for a conventional purchase.

While it's clear what you want, you need to enter the mind of the attorney and address each issue:You are an outsider soliciting people from the outside.