Every piece of automated equipment is conceptualized by marketers, developed by a myriad of designers and engineers, assembled by workers and production support staff in factories, who source components from countless companies employing their own workers and raw materials sourced by purchasing and logistics.  

Aside from the above, you must learn your market first, learn how to estimate rehab costs (as a contractor, that should be easy for you, but having knowledge of design and what items bring the most resale value are also needed) and how to estimate the exit values.

Would you recommend a certain architecture/design software for people who do not have a lot of design experience and really just need it for more basic building permit proposals?

Use what you learned in the book and look at properties for sale and go through the pictures and do your own estimates until you get a general sense of how much a rehab costs based on the your level of design and the home's level of disrepair.

I've seen a few mentions of designating office hours for communicating with guests.

Decorative wall panels are setting new trends for modern homes with a wide variety of designs, textures, and sizes.

@Brent Pearmanto be clear, what is you definition of "designated manager?" 

That makes much more sense.There are a lot of rules regarding ADU's including, but not limited to set backs (4' from rear and side), height restrictions (16'), size (max is 1200 but main house can not be smaller than ADU), parking (no covered or non covered parking is required to be added if you use the existing garage for your ADU so long as you are within range of public transport), renting (there are no longer requirements of owner occupancy of main house to rent out ADU (except for Junior ADU's), you CAN use tiny homes and prefabs as ADU's, if the detached garage is on the property line or inside the required 4' set back, you do NOT need to tear that down and if you do tear down the wall on or near the property line of the garage, you can rebuild it in its same location (prior years laws required you to then build outside the 4' set back), multi family properties are allowed 2 ADU's to be added plus you can convert non livable existing space into livable if you meet fire codes, and the list goes on.Another big benefit to the new laws is that if you keep the ADU at 750 sf or less, you avoid impact fees from the city keeping your permit costs down.There are a ton of other build out questions like costs of design/structural engineering, permit fees, etc.

If I were you, I'd shop some comps in the area to see what the properties on the market at the moment look like in terms of design and updates.

Not clear on what your question is but if you're asking how to control the continuity of design aesthetics with multiple builders in the same communtiy then as the developer you would set the architectural design and review process.