Your main things to consider when choosing a country:
1) Which country do you have nationality in / property in (or in this case do your parents have property in). It's probably easier to get paper-work done, bank accounts sorted, etc. in that one.
2) What are your longer term plans for the business - is it going to be a side-project or do you want to build it into a real business ? - in the later case you should be thinking about where would make sense in terms of hiring employees, raising investment, etc.
As for automating accounts I'd just hire an accountant and book-keeper and not sweat automation.
In terms of legal status you may not have even broken any kind of law yet, many countries will let you run businesses as an individual (without registering a company) as long as you file personal taxes on the revenue. Depending how recently you took that revenue in you may not even have reached the filing deadlines so it may just be a case of putting together the correct accounts.
But to start with I'd recommend finding an accountant you trust (preferably one with other SaaS clients).
Registering a business bank account without residency is going to be a huge pain though. Not sure what the best solution is (unless you're willing to actually settle down and become less nomadic).