North of Austin, the county regulations say you don't have to do it IF you're only doing residential, certain lot sizes and limiting the impervious cover of each lot.

Since the same 99% unknowingly violate some state law, rule, or regulation, you may be better off with an entity.  

Your numbers are way too tight, especially in today's environment.  

Are there extra steps or regulations I should know about?

There are very few sellers of notes right now, so who are you buying and selling too.You are going to be sadly dissappointed and realize after 3-6 months you probably wasted your money.Your best bet is to join some groups on FB or elsewhere and start to learn that way.Let me ask you this question: Have you spoken to any note investor out there to ask them about the environment today to actually get into notes? 

Quote from @Bruce Schussler: A lot of Podcasts and Youtuber's say to cash-out refinance to keep rents balanced with payment; (PITI) then use those funds strategically to re-invest either in more real estate or just put into a high interest bearing account or money market account...Here's some of my thoughts and comparisons;Cash-out refinance with new loan so rents balance with payment:- The cash-out refinance is 100% tax free- The funds can be put into a money-market account off-setting a portion of the interest charge of loan- The loan balance gets eventually destroyed by inflation- The liquid cash eventually gets destroyed by inflation - The interest on the new loan can be deducted from the rent income- The refinance costs are 3-4% of the total- There is less equity in the property and LLC that can be attached in case of a lawsuit- The break-even on cash-out refinance with current interest costs on the new loan is around 12 years Vs.Paid-off property with positive cash flow:- The positive rent income is 100% taxable minus only depreciation and property tax- There is more equity in the property and LLC that can be attached with a lawsuit- The break even is not until after 12 years at today's interest rates- There is a rate risk in today's inflationary environment where interest rates on bonds keep rising*It appears to me that the cash-out refi is in the best interest for a property investor; (Dave Ramsey would strongly disagree!)

And the numbers are pretty good on the projects I've looked at. these are the very recent regulation that's from what I read, it makes more sense to add ADU into small MF.

My properties are primarily in Arvada, CO, but I have a pulse on the market of regulatory environments throughout the state since I am almost entirely niched to STR investors in my business.

There are no commitals until it works for you and there are no regulations or fees associated with using the app. 

Now this might be controversial and some people may disagree with me (even some of my coworkers here at BiggerPockets may have a different opinion which I completely welcome), but I really don't think you should invest OOS in this current macro environment with less than $100k (down payment + reserves).