We got it rented before construction begins with 1 month turnaround.

My name is Marc and I have a background in construction and have rehabbed my current residence.

By the way, since you're young, have no money or experience, and want to get started in RE - let me give you something more constructive that you CAN do: Go work for someone, or even volunteer, in the business.

Please, does anyone here know a builder that constructs new homes duplex or triplex that can be recommended?

I would look at up-and-coming areas, recently, or soon-to-be completed construction projects (road, rail, infrastructure, etc..) that have not been realized in property value yet.. 

I used a FHA loan to get in to a HUD home, lived in it and completed the renovation, leveraged huge equity  to finish a second renovation that was technically a new construction loan, sold the rehab, got a partial lien release combined with a re-finance from the FHA loan, pulled $30k in HELOC, bought another rental, moved, and then rented the original SFR...then on and on...lots of moving parts.It's a lot like feeling your way through a maze where you are at right now, but don't be intimidated.

@Ned Carey - I think that's good advice, and conservative as well, but @Rob Wilcox got into buy-and-hold and apparently has done it successfully- maybe he would do well to diversify into building from the ground up.I've shied away from it for the reasons you mention, but dealing with 100+ units of housing, most of which was built over 100 years ago, occasionally leads me to think wistfully about new construction.

I am currently 61 years old and have about 30 years of experience in construction management and real estate. 

I am currently 61 and have many of years of experience in construction management and some in a broker license (actually about 30 years) in the state of Texas. 

I have managed over $350 million worth of Construction with over 2600 units rehabbed and/or built.