What steps have you already taken to address the situation?

We develop and consult new developers through the full cycle of development.Financing differs from project to project based on your equity, land cost, construction methods, etc.

But given you experience with getting anything from this group, I would not hold my breath that you will even see a response, even if financial statements are required to be provided.So, then you next step is a lawsuit to force reporting.  

Any recommendation for the first steps I should take if I want to purchase my first rental property using the BRRRR method (or flipping).

A real estate tax pro  can help optimize deductions, ensure compliance, and avoid costly mistakes most importantly so that would be the next step 

It’s exciting to see you taking the first steps in your real estate journey.

Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.

Don’t let that discourage you, but just know that stepping outside your comfort zone will be part of the journey from time to time.

then rent out each room where possible3) Buy an apartment with little to no HOA (hard), and rent out by room to save up more to make the next step.

Once you have that amount of units (leveraged), focus on paying those off via snowball method.