If you love writing software then you are already at a massive advantage to other non-tech founders. You will be closer to the problem and solution than anyone.
Don't waste time or money on an MBA. You can learn everything you need to know to run a SaaS in the $1M ARR range online. I wouldn't even stress about things like accounting and financial management like you mentioned. You should be worrying about finding product market fit and marketing.
A SaaS where the founder writes code is usually super lean. Don't worry about money problems until you are making it. :)