Personally, knowing the market and having good contacts is very important - and as @Victor N. said you must buy right here as I would not count on natural appreciation making your deal a home run. 

Understand that the main allure (human nature really) is always to start making $ as soon as possible, taking whatever shortcut you can take. 

Naturally, I looked into getting a duplex.

It's just the nature of the beast.Just make your whatever deal you're doing's numbers are good in your eyes, and go ahead and pull the trigger.The first one is always the scariest.  

Im a professional salesman and natural entrepenur  who likes to work and im not afraid of hard work  eitheir Any advise  Thank you in advance 

It is a natural reaction, and a pet peeve of many attorneys.

If you're not categorized this way, you will face limitations on losses that you can take in any given year, as your real estate activities will be considered "passive" in nature.

I understand it's hard work but luckily hard work comes natural to me.

With some of the experience (especially construction) I feel that it is only natural to take steps in investing.

Due to the obscure nature of the property, no one knew there were 3 buildable lots within it, so I got it for a pretty good price.