i want to keep the group small. not like industry scale crowdfunding.if I can find a property which has okay cashflow (which is hard anyways). and can collect around 10/20 people who wants to invest some cash each.I build a company to own the property and give each person a share. and give yearly dividend to each, until sold.

My question is.. does anyone have experience getting a conventional primary loan to build a 4plex and what if any experience can you share regarding the building of one.

You will build experience, you will have a property that builds wealth, and you will be ahead of the curve when the market turns favorable again.

Also besides residential there is commercial and industrial lands and a host of zoning issues.Each aspect and real estate type has maybe similar, but largely different skill set requirements. 

First thing you want to do is start building your network of people who can assist you in getting deals done and then find a good mentor.

To me, you'll have to try 2-3 months and run through an underwriting exercise of a building/properties about 10 times on each one to understand the true pros/cons of each model.

Specifically, I am focused on wholesaling as a way to build enough capital to start investing in SFR/multifamily with a buy and hold strategy.

It's an audience building tool that can also send customized DMs in any FB group to a curated list of people. 

Building a strong foundation is key to success in any real estate market.

The owner (or you) will also need to have commercial STR insurance on the building.