Reddit mentions of Relational Database Design Clearly Explained

If you own the data, go with RDBMS. Every time. DDDB's are useful when you want to store data from other systems that you don't really give a damn about (in terms of structure or content).

If I were you I'd do some book learning.

You need to come to a consensus on what constitutes a record in your system and use that to design a primary key. I think if you do some research into introductory DB concepts the rest will become obvious over time, FWIW.