@Matt Bob from what I am understanding you are wanting to start doing Bookkeeping/Accounting Services for Real Estate Investors? Provide them with financials monthly and help them to hand off finished financials to their Tax Preparer?
That is what my wife and I do with our Coaching and Bookkeeping Business. We use Wave(free) and QBO depending on the scope of work. QBO allows different categorization to different classes, Wave does not(found this out with growing pains, get what you pay for though) but you can find solutions for them.
If that is the case, I would find a job in real estate that allows you to do this on the side, for the mean time and grow your network, so you can build it up and find out what works for your demographic, then sell what you do, learn what you need to do better(just found out I need to add a new step to my analysis of potential clients), and offer them a good product. Charge a base rate, get reviews, and experience, then charge more when you grow and are worth more.
You talk about making the CPA's or tax preparer's life easier. They won't be the ones paying you, I think you need to shift focus to helping the clients and what you can do to better their lives.
What I do for my bookkeeping clients; I prepare your financials monthly to track expenses and help you to read the story of your business month to month, I prepare financials so you can easily have 1099s prepared in January and prepare financials to send to your Tax accountant and organize your details so a you don't need to give them a shoe box or any statements. It is ready to be entered and you save money on not paying that Accountant's hourly rate to organize paper for you. I will let you know if expense are missing or higher then normal, help you to make sure you have all your business expense accounted for, and I create reports to track all Balance Sheet items so that way we are ready for an Audit, if that happens. I have a Master's degree in Accounting and worked in Public accounting doing bookkeeping/financials for 7 years and taxes for 6 years.
This shows the benefits to them, they have someone who knows what they do and can talk about it to make sure transactions are accounted for, peace of mind I am qualified, peace of mind that an Audit will not be as scary with me compared to without me, financials will be proper and they have someone to help them translate this, and being prepared for tax season means they will save money. Less stress and saving money per year will get people's attention.
I think you are on the right track and have a good idea, you identified a problem and have started creating a solution, you just need to refine it and implement it. YOU GOT THIS!