1. If you are a developer who uses Git and knows what fast-forwards are and when and when not to use them, you already know literally everything there is to know about distributed/decentralised ledgers.
2. A blockchain controlled by a single organisation is just a really crappy database. And if you wanted a really crappy database for some reason, you might as well just use MongoDB†.
3. There is no 3. That’s everything. A consulting firm will charge you a million dollars and not give you advice as good as this. You’re welcome!

† It boggles my mind that there is sufficient demand for such a thing that the company behind it is still in business. Just use Postgres! You’re welcome.