I have the private money lined up for the 25% down payment.

Can you send the money to escrow instead of to the builder? 

Raising money is all about marketing and sales (not real estate specific) so either hire marketing agency and read sales books, or hop on some LinkedIn courses on marketing and sales.Not sure the legal structure to use: talk to accountants and attorneys.Need deal flow: talk to brokers and go to a lot of networking events.Lending terms: start calling banks and loan brokers.From there, it is all risk mitigation. 

I don't know anything much about real estate, nor have the money at the moment.

If I need by some chance I need extra money I can fund it with money from my side business.

It was an easy way to scale up with no money out of pocket.

What you have is money.

The biggest question you need to ask yourself is if you are doing this to afford a property you otherwise couldn’t afford or to save money period, that will lead to very different conclusions about where/if to buy. 

The same money could buy 1-2 full properties that would rent for more, depending on the market you choose. 

Move the money in and out as tenants move in and out.You need two accounts: checking and savings.