These softwares have a lot of functionality, but honestly there is a steep learning curve and the functionality is probably overkill for most rehabbers.FlipperForce - Web-based House Flipping Software built specifically for flipping & rehabbing houses w/ Estimating, Gantt Scheduling, Task Management & Budget ManagementGeneric Project Management SoftwaresThere are nearly an infinite amount of potential generic Project Management softwares available that provide powerful functionality for managing project schedules, tasks & documents. 

Make sure to include proper disclaimers. 

So, proper screening is EXTREMELY important!

The specialist I recommend you have is an attorney to properly draft the documents and a title company to facilitate the deal.

You have to properly vet and perform thorough due diligence (which I didn't do a couple years ago when I first jumped in).

Quote from @NA L Harrison: It is irresponsible of you to take in animals you can't properly house.

ADUs can significantly enhance your property's value by adding living space that can be used for rental income or as additional living quarters for family members.The increase in value from an ADU can vary widely depending on several factors such as the size, quality, and functionality of the ADU, as well as its integration with the main property.

I do have one question - I have a partner and we are looking into getting a properly together.

Most inspectors will know that properties only need to meet whatever the code was when they were built, not current code and they usually explain that properly IME.

STR's, if done right, are viable long term investments meant to cash flow at a reasonable enough level to properly maintain and improve them.