You will start out as an individual investor and then as you scale become a commercial investor.

As a self-employed 1099 individual, your best route is most likely DSCR.

i do think it's challenging, though, for a brand new investor with zero experience to jump right into a huge rehab with a contractor they've never worked with before.the contractor might want a larger up-front payment to mitigate their own risk, and they're not going to be interested in any kind of fancy nonsense like a 'penalty' when they know a new investor has never managed a large project before.i have also found that some contractors, including reputable ones, don't even want to share itemized bids because they just don't want to have to argue about the individual line items. 

@Nold R.In addition to the great post from Dave, possibly consider an option where the property is taken out of the LLC sooner rather than later and held as tenants-in-common prior to the sale, possibly setting you up in a position to take your share of the proceeds and individually purchase a replacement property via 1031 exchange. 

We have in our management agreement what amount of work we're authorized to have done without an approval from an owner (ours is $350)  If you don't have that, I would request that. 

Separate LLC per Property: Maximizes liability protection but adds complexity and costs with individual tax filings.3.

My best advice would be to read through the contract carefully (builders usually have their own individual contract that's written for them and is leaning heavily in their favor).

and connecting with local REI individuals and attending meetups to learn from experienced investors. 

My contractor has one credit card for all of my individually owned buildings (jointly not multiple cards) and one credit card for the building I own in a partnership.

Break down your rehab into individual jobs, for example get a electrician for electrical work, a plumber to repipe the house, a dry wall guy to close out the walls, etc.