Answer 1

1. write down what features you want to implement.

2. draw use cases, and ER diagram of your system.

3. from all the features, find out which is must to create a barebone mvp.

4. develop those must have features first.

5. refactor your code.

6. implement the features you didn't prioritize for an mvp.

7. refactor, and repeat.

PS: Google is your best friend.
mvp: minimum viable product