I’ve been saving and learning a ton about real estate and eager to get started.

My new job once I start will start up my savings once again.Basically the decision I’m fighting with in my head is 2 paths to buy my new house and keep my current:1- save up as much as I can from new job.

Outside of this, I don't have much in savings.

Then you could save up some more money and consider buying another place to move into and rent out the other side of the duplex... 

We saved up money and now have the money to buy the house.

If you are planning on exiting the property within a short amount of time the benefits may not be worth it- I would check with your CPA and/or cost seg tax specialist on it- Michael Blank interviewed a cost segregation expert on his show- episode 23 I believe titled "Save BIG with Cost Segregation for Multifamily Buildings"- they discussed cost segregation on SF + multifamily assets so I recommend checking it out!

My recommendation is that you save up enough to cover one year of expenses because you won't make much until your second or third year, if you stick it out long enough.

I had been holding on to this money for a couple of years hoping to get a multifamily , but the prices in NYC are just crazy right now, I feel that we're in a bit of a bubble, and it came down to a choice between keeping it in a 1 year CD and generating 4K,or paying off my mortgage and saving 8K/year.

Should i look to investors/ loan/ line of credit and borrow money or wait like a year and save up?

Unless you are doing good volume it likely is not going to save you much.