From my understanding it comes from the NOI but I guess you could bring in extra in the beginning to speed up the process?

I (and many others) have talked about syndications on this forum and there is plenty of 'education' out there to get up to speed.

The combination of debt paydown, equity build, and appreciation and time are what build wealth.I would suggest taking a couple months to network on BP...setup your keywords, follow the forums and a market will appear...I'm personally big on Columbus, Oh because I live and work here...but you will find some really well qualified investor agents on BP that can speed up your learning curve by doing some 30-minute interviews with them...unfortunately, you can't escape the legwork.Always glad to chat more on our location or investing in general.

In addition, gain recognition is not triggered by dispositions after the death of one of the parties or by dispositions in compulsory or involuntary conversions (within the meaning of IRC Sec. 1033) [IRC Secs. 1031(f)(2)(A) and (B)].

Can you speed up the 2 year living as a primary residents to get the tax exception?

While this is not for everyone, it has multiple benefits and will help speed up your investing journey. 

At our current renovation speed we'll have 3-4 units every month only, so does it worth to pay fees to post on apartments.com or zillow?

Of course, there are plenty of books to read and speed up the learning process.

The right contractor can provide you with expertise and speed on a project that you just can't do yourself. 

I did all of this quickly as any young kid who is technologically able could, and the company controller who I was working under was impressed by my speed of completion.