Design/pre-plan as much as possible.

What does getting a NARPM designation do except signal to me that you're a PM willing to spend some money with an association? 

When a tenant moves out, transfer the deposit back to Checking so it's ready to apply towards expenses or refund the Tenant.If you end up with excess funds in the Checking account, I recommend you transfer it to a third account designated explicitly for future investments.

BiggerPockets is full of resources designed to help you along your journey, whether you are just getting started or a seasoned investor.

I hired an architect and he did some rough designs.

I'm working with a local engineer on finalizing a couple of ready to build ADU/triplex plans that I designed specifically for Oregon for my own uses, but you've got me thinking re: scale in general.  

Rent collection is free only with the subscription, does credit building, great rental contract generator, site is very simple in design.

I’ve been designing residences for so long, but I have yet to invest in RE!

They can't be vague and are specifically designed not to be left open to the subjective interpretation of a fact finder. 

We’re trying to figure out what to expect cost-wise for furnishings and interior design.