After that I'd say dig deep here on BP: podcasts, books, blogs, forum, etc.Hope that helps some, feel free to reach out if you'd like to talk shop.Cheers!

I am currently knee deep in literature as well as developing a plan of attack to get in the market...  

a couple of box fans + 20x20 filters.... run continuously 1-2 days. dump the filters directly into a trash bag. replace and re-run.have the ac/heat ducts (if any) professionally cleaned... you don't want to breath the nasties again....also i would check for cold/humid sections of walls. also crumbly (drywall/plaster) around baseboards. if you have those, (respectfully sorry) you are in for a surprise if you open the walls.....now, what is the source of humidity?

One day, I'll live in a forest in Oregon or in the mountains in Colorado, but for now, this will do...Any other things you can do to breathe cleaner air in a city?

You being a commercial RE broker you may have people who like you with deep pockets who are willing to gamble on you as a newbie to real estate investing.  

At first this is probably not going to grow very quickly, so to answer your question, you will likely be using the same sources to save up for the next down payment as you did for the first (W2 income or side hustle), but you will hopefully have the cashflow from the first property to supplement.Of course you can use private money or partners to accelerate growth of your portfolio if you develop a track record.Ideally you will buy at a deep discount (built-in equity), do some value-add renovations that drive up the value by more than the cost of the renovations (forced equity) so that when the time comes, you can cash-out refinance all that built up equity and accelerate purchase of the next property.

Wish I could jump in the deep end on actively pursing wholesale, because I see how this is the first rake of ROI.  

It usually comes 2cm with a laminated front edge, and is 26in deep for standard cabinets.  

deep sigh. 

We are knee-deep in research to make sure we amass the knowledge needed for our future investments to work for us.