Many lenders hare restrictions or guide lines on how long you have to keep the house in order to flip the house, while others have guidelines on how small a mortgage they will consider.

There are "rules of thumb" to operate by, but they are general guides that change with time and definitely change with markets. 

Can anyone guide me for REO foreclosure list and how is the procedure here?

I would let the numbers guide you.

Quote from @Kenji Van Thuyne: Start with BiggerPockets Ultimate Beginners Guide (free).

It's a balancing act where we guide our clients as best we can but ultimately they make the final decision.  

I've developed a real estate agent on the island of St Croix (Cynthia Taylor) to help evaluate the properties and guide my offer. 

It's normal to feel uncertain, but knowledge can help reduce fear and guide you through the process.For those navigating these complexities, there are resources available that can assist with understanding your options.

But to get the right education, you need to be guided by people who are more experienced than you are.

Read this book first - https://www.amazon.com/Every-Landlords-Property-Protection-Guide/dp/1413307000 - before getting into more complicated and expensive measures of protection.